JP2006318589A - Information recording apparatus, information reproducing apparatus, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording device, of which the information is recordable while easily changing the enciphering information for every short recording unit when the information is enciphered and recorded on a recording medium, and also the changes such as a dividing, combining and deleting can be performed with respect to the enciphered information. <P>SOLUTION: The recording operation are carried out for: the information for specifying sections of the information; a license including the information for specifying the number of the recording unit in each of these sections, of which the each section is divided by the predetermined data amount; and the information enciphered by the enciphering information generated from the number of the recording unit is recorded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information recording apparatus, an information reproducing apparatus, a program, and a recording medium, and more specifically, an information recording apparatus that mainly encrypts video information and audio information and records the information on a recording medium. The present invention relates to an information reproducing apparatus that reproduces existing information, a recording program incorporated in the information recording apparatus, and a recording medium that is a recording target thereof.

  With the increase in speed and capacity of recording media, video information and audio information are widely recorded as digital data on recording media. Such information is often encrypted and recorded to avoid unauthorized use.

  Since video information and audio information need to be transferred at high speed, common key encryption capable of high-speed processing is often used as the encryption method. However, when the entire information is encrypted using a single encryption information, the entire information becomes usable when the encryption information is exposed. For this reason, it is preferable to divide the information into short parts and change the encryption information for each section. In that case, the problem is how to change the encryption information for each short part.

  An information recording / reproducing apparatus for solving this problem has been proposed (see, for example, Patent Document 1). An information recording / reproducing apparatus described in Patent Literature 1 divides information to be recorded into predetermined data amounts, and assigns serial numbers that continuously change to each predetermined data amount unit. A secret key-defined function generated based on a key sequence generation radix set for each range managed by one license and a number that changes for each key data generation radix and a predetermined amount of data An encryption control means for generating an encryption key from the storage means, a storage means for associating and storing the serial number and the first logical address where each data within a predetermined data amount unit is recorded as another information, and to be recorded The encryption means for performing block encryption based on the encryption key from the encryption control means for each minimum division unit of the data amount smaller than the predetermined data amount, and the signal encrypted by the encryption means. Together with recorded on a recording medium, and configured to have a recording means for recording another information stored in the storage means.

  In the apparatus described in Patent Document 1, since the encryption key for encrypting the information to be recorded is updated for each predetermined amount of data, even if the encryption key is revealed, the damage is minimized. Can do.

  FIG. 21 is a diagram for explaining a conventional information recording / reproducing apparatus, and is a block diagram of a main part of the information recording / reproducing apparatus described in Patent Document 1. In this information recording / reproducing apparatus, a transport packet having a fixed length of 188 bytes defined by MPEG2 obtained by receiving BS digital broadcast or CS digital broadcast is supplied to an adder 101, where the system clock of the transport packet is transmitted. A 4-bit value corresponding to the arrival time of the transport packet from the time stamp counter 102 synchronized with is added as a time stamp. As a result, a recording packet of 192 bytes in total is extracted from the adder 101 and supplied to the memory controller 103. The memory controller 103 receives the recording packet from the adder 101 as an input and stores it in the memory 105.

  The memory controller 103 stores the recording packet in the memory 105 so that seven recording packets are arranged in units of three consecutive sectors. In Patent Document 1, a unit composed of three sectors is defined as a minimum access unit (Minimum Access Unit). A logical address starting from 0 is assigned to the sector. The memory controller 103 reads out the recording packet stored in the memory 105 in units of the media access unit, assigns a media access unit number 104 that is a continuous number, and supplies it to the encryption unit 106 for encryption. For example, block encryption is performed for each recording packet unit under the control of the encryption control unit 108. Note that the media access unit number 104 is not encrypted.

  In Patent Document 1, a key for content encryption / decryption associated with a media access unit number 104 (or a serial number from the head media access unit) assigned to each media access unit is calculated, and the following is performed. The decryption key can be uniquely calculated from the media access unit number 104 of the media access unit accessing the.

  That is, in FIG. 21, the central processing unit (CPU) 113 writes a seed (SEED) 109 that is a common key sequence generation radix, which is a basis of the encryption key, into the encryption control unit 108 and supplies it to the memory controller 103. The same media access unit number as the media access unit number 104 to be supplied is supplied to the encryption control unit 108. The encryption control unit 108 generates a secretly defined function (secret function) F110 based on the seed 109 and the media access unit number from the CPU 113, and calculates an encryption key (key) 107 using this function. The data is supplied to the encryption unit 106.

  The encryption unit 106 reads the data, which is read from the memory 105 by the memory controller 103 in units of media access units, and to which the media access unit number 104 that is a continuous number is added, based on the encryption key 107, for example, a recording packet Block encryption in units. The data encrypted by the encryption unit 106 is temporarily stored in the memory 112 by the HDD controller 111 and then read and written to the HDD.

  Here, the concept of a sector exists as a minimum unit that can be accessed by a hard disk, an optical disk or the like, and an identification number, that is, a logical address is assigned to the sector. In this example, when the media access unit is recorded, the media access unit number 104 and the logical address of the hard disk are recorded in association with each other. That is, the CPU 113 associates the media access unit number 104 with the first logical address of the data in the media access unit number 104 to be recorded on the HDD, and stores it in a memory in the CPU 113 as a table.

  That is, the top logical address of a plurality of sectors (each unit divided into a predetermined amount of data from the top of a series of records) to which the same media access unit number 104 is assigned, and the media access unit number 104 are Stored in the table above.

  This table is organized and stored in a separate file as auxiliary information for high-speed playback. The information that the Nth data of the media access unit number is recorded at the logical address M of the HDD is recorded in the HDD as information (file) different from the content (AV data). The seed 109 is recorded separately from the AV data in the HDD by the CPU or the like using strong encryption means such as a public key.

In this way, in Patent Document 1, since the encryption key is calculated from the media access unit number 104 and the seed 109, the key 107 for content encryption that is easily and sequentially required at the time of recording is calculated. be able to.
JP 2003-115830 A

  However, in the apparatus described in Patent Document 1, only recording and reproduction are considered. Therefore, information cannot be divided / combined / deleted. In the case of handling video information and audio information, it is necessary to delete the information as an editing function such as scene deletion or unnecessary portion cut. In order to realize the deletion, it is necessary to divide the information at the deletion position. In addition, it is necessary to combine the information in case the information is unnecessarily divided.

  The present invention has been made in view of the above-described circumstances, and when information is encrypted and recorded on a recording medium, it can be recorded while easily changing the information for encryption for each short part, and is encrypted. Information recording apparatus capable of making changes such as dividing, combining and deleting the recorded information, and information reproduction capable of immediately reproducing any part of the information recorded on the recording medium It is an object of the present invention to provide an apparatus, a recording program to be incorporated into the information recording apparatus, and a recording medium to be recorded.

  The present invention is constituted by the following technical means in order to solve the above-described problems.

  In the information recording apparatus, the first technical means divides the inputted information into a plurality of parts and further divides each part into recording units with a predetermined data amount, or the inputted information as a part A dividing unit that divides the recording unit into a predetermined amount of data, a number assigning unit that assigns a continuous number to the recording unit within each part, and information for encryption is generated using the numbers assigned by the number assigning unit. An encryption unit for encrypting information included in a recording unit with the encryption information, a license generation unit for generating a license including number information designating a number assigned by the number assignment unit, and the division unit The encrypted information encrypted by the encryption unit for each part divided by the above, position designation information for designating the position of each part in the input information, and generated by the license generation part In association with licenses, in which characterized by including an output unit for recording on a recording medium.

  The second technical means, when the first technical means further divides any part of the result obtained by dividing the input information by the dividing unit into a plurality of parts, The license splitting unit for splitting the license corresponding to the changed part is provided.

  In the third technical means, in the first or second technical means, when the adjacent parts of the divided parts are combined, the numbers assigned to the respective parts are consecutive with respect to the adjacent parts. In this case, a license combining unit that combines licenses corresponding to the adjacent portions is provided.

  In the fourth technical means, when any one of the divided results is deleted in any one of the first to third technical means, the license corresponding to the part to be deleted is deleted at the same time. It is characterized by doing.

  According to a fifth technical means, in the information reproducing apparatus, for a predetermined part of the information, an input unit that searches for and reads a corresponding license and reads the encrypted information, and information that specifies a number included in the license And a decoding unit that generates and decodes the decoding information.

  A sixth technical means is a program to be incorporated into an information recording apparatus provided with an arithmetic processing unit so as to be executable. The information recording apparatus divides input information into a plurality of parts, and each part is further predetermined. A division step for dividing the entire inputted information into recording units by the predetermined data amount, and number allocation for assigning a serial number to the recording unit within each portion Generating information for encryption using the number assigned in the number assigning step, encrypting information included in a recording unit with the encryption information, and assigning in the number assigning step A license generating step for generating a license including number information for designating the assigned number, and the encryption for each part divided in the dividing step An output step of associating the encrypted information encrypted in step, the position designation information for designating the position of each part in the input information, and the license generated in the license generation step, and recording it on a recording medium; Hardware that can execute a predetermined step, and the program includes the division step, the number assignment step, the encryption step, the license generation step, and the output step other than the predetermined step. The step is executed by the arithmetic processing unit.

  The seventh technical means is a recording medium that can be played back by the information reproducing apparatus in the fifth technical means, and the position designation information for designating the position of each part in the information, and each part with a predetermined part. It is characterized in that a license including number information for specifying the number of recording units divided by the amount of data and information encrypted with the encryption information generated from the number of recording units are recorded.

  According to the present invention, when information is encrypted and recorded on a recording medium, the information can be recorded while easily changing the encryption information for each short part, and the encrypted information is divided, combined, and deleted. It is possible to make changes such as Further, according to the present invention, it is possible to immediately reproduce any part of the information recorded on this recording medium.

  The present invention includes an information recording apparatus for encrypting information and recording it on a recording medium, an information reproducing apparatus for reproducing information recorded on the recording medium, a recording program and a reproducing program stored in these apparatuses, and these apparatuses. The present invention relates to an information recording / reproducing apparatus and a recording medium to be recorded. The information recording apparatus and the information reproducing apparatus according to the present invention are respectively composed of a recording part and a reproducing part in the information recording / reproducing apparatus described below. Omitted for simplicity. The present invention will be described mainly using a removable hard disk as an example of an information recording medium, but is not necessarily limited to this. For example, any recording medium can be used as long as it is a recording medium capable of random access and high-speed access, such as a hard disk / read / write DVD / magneto-optical disk / nonvolatile semiconductor memory incorporated in an information recording / reproducing apparatus. It is applicable to.

  FIG. 1 is a block diagram showing a basic configuration example of an information recording / reproducing apparatus according to the present invention. In the figure, 10 is an information recording / reproducing apparatus, a dotted arrow indicates a flow of a control signal, and a solid arrow indicates a data signal. Shows the flow.

  The information recording / reproducing apparatus 10 receives operation signals from an external input / output interface (I / F) 11 for detachably connecting a removable recording medium 20, a receiving unit 12 for inputting video information, and an operation input means 18. User I / F 13 to be input, control unit 14 having a CPU and memory for controlling the information recording / reproducing apparatus 10, and the like, generating information for encrypting / decrypting information of video information, and encrypting / decrypting the video information An encryption unit 15 that reproduces the video information, and a buffer 17 that temporarily stores the video information. Further, the operation input means 18 and the display means 19 are arranged integrally or externally connected to the information recording / reproducing apparatus 10. The removable recording medium 20 is detachably disposed on the information recording / reproducing apparatus 10 independently of the information recording / reproducing apparatus 10.

  Each component of the information recording / reproducing apparatus 10 is demonstrated in detail. The external input / output I / F 11 is an interface for connecting the information recording / reproducing apparatus 10 and the removable recording medium 20. The external input / output I / F 11 also holds an attachment / detachment mechanism for the removable recording medium 20 and an interface for reading / writing data. The receiving unit 12 is a means for inputting video information, and may be, for example, a tuner that receives a digital broadcast signal or an analog broadcast signal, an input means such as an IEEE 1394 interface, or an input means from a digital camera. .

  The user I / F 13 is a part for selecting operations in the information recording / reproducing apparatus 10 such as channel selection of digital broadcasting and recording / reproducing operations. The control unit 14 is a part that controls each component based on an input from the user I / F 13. The encryption unit 15 is a part that generates encryption information / decryption information for video information and encrypts / decrypts the video information. The reproduction unit 16 is a part that reproduces video information. The buffer 17 is a buffer for temporarily storing video information for reception or reproduction. The operation input means 18 is means for a user to operate the information recording / reproducing apparatus 10. The display means 19 is for displaying video information and an OSD (On Screen Display) created by the user I / F 13. The removable recording medium 20 is a recording medium that records encrypted video information and a license necessary for using the video information.

  In this configuration example, for example, an ATA (AT Attachment) interface is used as an interface for reading / writing data with the removable recording medium 20 in the external input / output I / F 11, but an interface such as USB (Universal Serial Bus) or IEEE1394 is used. May be used. In this configuration example, the receiving unit 12 is a digital broadcast signal receiving unit. However, the receiving unit 12 may be a unit that acquires content via a network. Regarding the reading / writing of data to / from the removable recording medium 20, the receiving unit 12 of the digital broadcast signal, the reproducing unit 16 for decoding the video information, etc., it is not particular to the present invention. This is the same as that adopted in the digital high-definition recorder HRD2. Details of the encryption unit 15 will be described later.

  The operation input means 18 is typically an operation remote controller or a button provided in the information recording / reproducing apparatus 10. The display means 19 is, for example, a display device such as a liquid crystal display, a plasma display, or an EL display. The removable recording medium 20 is a removable hard disk, for example.

<First Embodiment>
FIG. 2 is a flowchart for explaining an example of the processing procedure of the information recording / reproducing apparatus according to the first embodiment of the present invention. First, the process in the normal viewing state that is executed by the information recording / reproducing apparatus 10 illustrated in FIG. 1 will be described.

  First, the information recording / reproducing apparatus 10 inputs video information from the receiving unit 12 (step S1). This video signal is a TS (Transport Stream) selected for digital broadcasting or a PS (Program Stream) from an external playback device. The channel to be selected is not clearly shown in the flow of FIG. 2, but is selected in advance by the operation input means 18 via the user I / F 13. And the control part 14 inputs the information of the channel which should be selected from user I / F13 with respect to the receiving part 12, and the receiving part 12 performs a channel selection operation | movement based on the information.

  Following step S1, the information recording / reproducing apparatus 10 temporarily accumulates the video data from the receiving unit 12 in the buffer 17, and the reproducing unit 16 inputs the video data in the buffer 17 (step S2). Finally, the reproducing unit 16 decodes the video information and outputs the video signal to the display unit 19 (step S3).

  Next, a processing procedure for recording video information executed by the information recording / reproducing apparatus 10 illustrated in FIG. 1 will be described. First, the data structure will be described with reference to FIGS.

  FIG. 3 shows that the dividing unit 14a in the control unit 14 divides the information into one or a plurality of parts, and each part is recorded with a predetermined data amount S (in this embodiment, illustrated with 1.5 Mbytes). It shows how it was divided by. Here, dividing information into one part means that the entire information is regarded as a part after division. In FIG. 3, the top three divided as the information 31 are illustrated, and are indicated as part 1, part 2, and part 3 from the top. In FIG. 3, the information 31 is shown in association with the relative coordinates from the information head of each part and the list 32 of numbers assigned by the number assigning unit 14 b in the control unit 14.

  Part 1 is the head part of the information and starts from relative coordinate 0. The recording unit has a size of 3, and a serial number from 1 to 3 is assigned to each recording unit. Part 2 is a subsequent part of part 1 and starts with relative coordinates 3 × S. The recording unit has a size of m-3 (m is an integer of 4 or more), and a serial number from 4 to m is assigned to each recording unit. Part 3 is the part that follows part 2 and starts from the relative coordinates m × S. The recording unit has a size of nm (n is an integer on m + 2), and a serial number from m + 1 to n is assigned to each recording unit.

  Here, how to divide the portions can be arbitrarily divided as long as each portion (other than the end) is an integral multiple of the recording unit S. For example, the following dividing methods (1) to (4) are available. Is possible.

(1) The whole is a single part (for example, the whole is only part 1).
(2) Divide a portion of video information every minute.
(3) Dividing based on the input from the operation input means.
(4) The control means divides according to a predetermined rule.

  With regard to the above (2), dividing the video information into parts every minute has the following advantages. In BS digital broadcasting / CS digital broadcasting / terrestrial digital broadcasting, “copying only for one generation” is often designated as copy control information for video information. When such video information is recorded on a recording medium and then copied to another recording medium, it is necessary to perform a so-called move that erases the video information of the original recording medium after copying. At that time, there is a restriction that both the moving source and the moving destination must not be able to play back video information having a length exceeding 1 minute at the same time. By executing the deletion described later each time each part is moved, the restriction can be satisfied.

  Regarding (3) above, when dividing into parts by input from the operation input means, for example, it is conceivable to divide each chapter specified by the user (part when the video title is divided). Regarding the above (4), as a rule to be divided by the control means, it is conceivable that the rule is divided when a digital broadcast program (program) changes.

  FIG. 4 is a diagram showing a correspondence relationship between position designation information (position in video information) of each part and a license (including number information for designating a number). In the present embodiment, the start position and the end position are described in relative positions (byte units) from the beginning, but the present invention is not limited to this, and may be described in sector units or recording units instead of byte units. In the correspondence list 33 illustrated in FIG. 4, the start position of the part 1 is 0, the end position is 3 × S−1, the corresponding license is L1, the start position of the part 2 is 3 × S, and the end position is m ×. S-1, corresponding license is L2, part 3 has start position m × S, end position n × S-1, and corresponding license L3. Here, L1 / L2 / L3 is information for specifying a license and a license ID. The license ID can be specified by a number or a recording position on the recording medium 20.

  FIG. 5 is a diagram for explaining the correspondence between the license and the number information held by the license. In the correspondence list 34 illustrated in FIG. 5, the head of the serial number of each part is stored as number information, 1 for the license L1, 4 for the license L2, and 4 for the license L3. Stores m + 1. As shown in FIG. 1, the removable recording medium 20 has a normal area and a secure area, and the encrypted information is stored in the normal area, but the contents of the license are stored in a secure area that can be read and written only by an authorized device. Store. The relationship between the position designation information and the license may be stored in the normal area.

  FIG. 6 is a diagram for explaining a flow during recording. First, video information is input from the receiving unit 12 (step S11). This process is the same as step S1 described in FIG. Next, the video information from the receiving unit 12 is temporarily stored in the buffer 17 (step S12). Next, the dividing unit 14a included in the control unit 14 divides the video information into parts by the above-described method based on the input amount of the video information in the receiving unit 12 and the input from the user I / F 13, and further, the recording unit. The video information is divided into two (step S13). As described above, the dividing unit 14a divides the input information into a plurality of parts and further divides each part into recording units with a predetermined data amount, or the input information as a part with a predetermined data amount. Divide into recording units.

  Following step S13, the number assigning unit 14b included in the control unit 14 assigns a serial number for each recording unit (step S14). As described above, the number assigning unit 14b assigns a continuous number to each recording unit in each part, and in this embodiment, the number is assigned from 1. In the present embodiment, numbers are assigned consecutively so that the number does not jump even if the portion changes.

  The encryption unit 15 generates encryption information based on the number assigned by the number assignment unit 14b (step S15). The generation of the encryption information will be described later. In step S15, the encryption unit 15 also encrypts the video information (information included in the recording unit) in the buffer 17 with the generated encryption information. The encryption method will also be described later.

  Next, the information recording / reproducing apparatus 10 records the encrypted video information on the removable recording medium 20 via the external input / output I / F 11 (step S16). Next, license / position designation information is generated by the license generation unit 14c included in the control unit 14 (step S17), and similarly recorded on the removable recording medium 20 (step S18). As described above, the license generation unit 14c generates a license including number information for designating the number assigned by the number assignment unit 14b. The license generation unit 14c also generates position designation information that designates the position of each part in the input information. Finally, the external input / output I / F 11 records the license, the position designation information, and the encrypted video information in the removable recording medium 20 in association with each other.

  By repeating the above procedure until the end of the video information, the video information can be recorded while easily changing the encryption information for each short part.

  The encryption method in step S15 will be described. Common key encryption is used as the encryption method. As the common key encryption, triple DES (Data Encryption Standard), AES (Advanced Encryption Standard), or the like can be used. It is also possible to record the encryption method used in the license. In the present embodiment, the above-described encryption method is used in a CBC (CipherBlock Chaining) mode. In the CBC mode, an encryption key and an initial vector are required as encryption information.

  The generation of encryption information in step S15 will be described. For example, the following methods (A) and (B) can be considered as a method for creating the encryption information.

(A) The initial vector generation information and the encryption key are stored in the license, and an initial vector is generated from the number and the initial vector generation information.
(B) The encryption key generation information and the initial vector are stored in the license, and an encryption key is generated from the number and the encryption key generation information.

  In either method, it is necessary to generate an initial vector or license from the number and generation information. As the method, for example, the following methods (a) and (b) can be considered.

(A) The generation information is bit-shifted by the number of times.
(B) The number is encrypted with the common key encryption using the generation information as an encryption key.

  As a method for generating the encryption information, a specific method may be selected as a matter of course, or the generation method may be recorded in the license.

  In the present embodiment, in step S14, numbers are assigned consecutively so as not to be skipped even if the portion changes, but it is not always necessary to do so. However, in order to combine licenses by the method described later in the third embodiment, it is preferable to assign them continuously.

<Second Embodiment>
Next, a processing procedure for dividing a license, which is executed by the information recording / reproducing apparatus 10 illustrated in FIG. 1, will be described. In the present embodiment, a case where the portion 3 of the video information recorded in the first embodiment is divided at k × S from the head of the video information will be described as an example. First, the data structure will be described with reference to FIGS.

  FIG. 7 is a diagram for explaining what part the video information is divided into, corresponding to FIG. FIG. 7 shows information 41 obtained by further dividing the portion 3 among the top three divided as the information 31 in FIG. 3 as information 41. 3 is written. In FIG. 7, relative information from the information head of each part and a list 42 of numbers assigned by the number assigning unit 14b are associated with the information 41.

  In this embodiment, the structure of the part 1 / part 2 is the same as that of the first embodiment. The part 4 is a subsequent part of the part 2 and starts from the relative coordinates m × S. The recording unit has a size of km (k is an integer on k + 2), and a serial number from m + 1 to k is assigned to each recording unit. The part 3 is a succeeding part of the part 4 and starts from the relative coordinate k × S. The recording unit has a size of nk (n is an integer on k + 2), and consecutive numbers from k + 1 to n are assigned to each recording unit.

  FIG. 8 is a diagram showing a correspondence relationship between position designation information (position in video information) and licenses (including number information for designating numbers) corresponding to FIG. In the correspondence list 43 illustrated in FIG. 8, part 1 / part 2 is the same as in the first embodiment. The start position of the portion 4 is m × S, the end position is k × S−1, and the corresponding license is L4. The start position of the part 3 is k × S, the end position is n × S−1, and the corresponding license is L3.

  FIG. 9 is a diagram for explaining the correspondence between the license and the number information held by the license, corresponding to FIG. In the correspondence list 44 illustrated in FIG. 9, the license L1 / license L2 is the same as that in the first embodiment. As number information, the license L4 stores m + 1, and the license L3 stores k + 1.

  FIG. 10 is a diagram for explaining a flow at the time of division. The control unit 14 reads position designation information from the removable recording medium 20 via the external input / output I / F 11 (step S21). Next, the license is read in the same manner (step S22). Next, the license dividing unit 14d included in the control unit 14 divides the position designation information as shown in FIG. 8, and assigns a new license L4 (step S23). Next, the license L4 is generated as shown in FIG. 9, and the number information of the license L3 is rewritten (step S24). Next, the control unit 14 writes position designation information to the removable recording medium 20 via the external input / output I / F 11 (step S25), and also writes a license (step S26). In this way, the license dividing unit 14d corresponds to the part that is the target of the division when any of the parts obtained by dividing the input information by the dividing unit 14a is further divided into a plurality of parts. The license to be read is also read and divided.

  By applying this embodiment, the license can be divided by the simple procedure as described above. In the present invention, the number information is not changed as shown in FIG. 9 and the starting value of the number is made variable, thereby providing the following advantages. In other words, if the start value is fixed, the generated encryption information will not change when generating the encryption information from the number. If the encryption information changes, it is necessary to decrypt with the original encryption information and re-encrypt with the new encryption information.

<Third Embodiment>
Next, a processing procedure when combining licenses executed by the information recording / reproducing apparatus 10 illustrated in FIG. 1 will be described. In the present embodiment, the case where the portion 1 and the portion 2 of the video information recorded in the second embodiment are combined will be described as an example. First, the data structure will be described with reference to FIGS. In the present embodiment, the numbers in the recording units of the portion 1 and the portion 2 are continuous.

  FIG. 11 is a diagram for explaining what part the video information is divided into, corresponding to FIG. In FIG. 11, information obtained by combining part 1 and part 2 out of the four heads divided as information 41 in FIG. 7 is shown as information 51. Yes. Further, in FIG. 11, relative information from the information head of each part and a list 52 of numbers assigned by the number assigning unit 14 b are shown in association with the information 51.

  In this embodiment, the structure of the part 4 / part 3 is the same as that of the second embodiment. The portion 1 starts from the relative coordinate 0, has a size of the recording unit m, and a serial number from 1 to m is assigned to each recording unit.

  FIG. 12 is a diagram showing the correspondence between position designation information (position in video information) and licenses (including number information for designating numbers) corresponding to FIG. In the correspondence list 53 illustrated in FIG. 12, part 4 / part 3 is the same as in the second embodiment. The start position of part 1 is 0, the end position is m × S−1, and the corresponding license is L1.

  FIG. 13 is a diagram for explaining the correspondence between the license and the number information held by the license, corresponding to FIG. In the correspondence list 54 illustrated in FIG. 13, the license L4 / license L3 are the same as those in the second embodiment. The license L1 stores 1 as number information.

  FIG. 14 is a diagram for explaining a flow at the time of combination. The control unit 14 reads position designation information from the removable recording medium 20 via the external input / output I / F 11 (step S31). Next, the license is read in the same manner (step S32). Next, the license combining unit 14e included in the control unit 14 combines the position designation information as shown in FIG. 12 (step S33). Next, the license L2 is deleted as shown in FIG. 13, and the license L1 is rewritten to combine the licenses (step S34). Next, the control unit 14 writes the position designation information to the removable recording medium 20 via the external input / output I / F 11 (step S35) and also writes the license (step S36). As described above, when combining the adjacent parts among the divided parts, the license combining unit 14e, when the numbers assigned to the respective parts are consecutive with respect to the adjacent parts, Combine licenses corresponding to adjacent parts.

  By applying this embodiment, it is possible to combine licenses with a simple procedure as described above. If the recording unit numbers are not consecutive in the parts to be combined, it is necessary to decrypt with the original encryption information and re-encrypt with the new encryption information. Further, in the present embodiment, only two portions are combined, but if the numbers of recording units of the respective portions are consecutive for three or more portions, they can be combined in the same procedure.

  By using the combination function in the present embodiment, the number of licenses necessary for recording video information can be reduced. In general, the secure area has a higher implementation cost than the normal area and has a smaller area, so it is advantageous to be able to reduce the number of licenses.

<Fourth Embodiment>
Next, a processing procedure when erasing video information executed by the information recording / reproducing apparatus 10 illustrated in FIG. 1 will be described. In this embodiment, the case where the portion 4 of the video information recorded in the third embodiment is erased will be described as an example. First, the data structure will be described with reference to FIGS.

  FIG. 15 is a diagram for explaining what part the video information is divided into, corresponding to FIG. In FIG. 15, information obtained by deleting the portion 4 among the top three divided as the information 51 in FIG. 11 is illustrated as information 61, and is denoted as portion 1 and portion 3 from the beginning. In FIG. 15, relative information from the information head of each part and a list 62 of numbers assigned by the number assigning unit 14b are associated with the information 61.

  In the present embodiment, the structure of the part 1 / part 3 is the same as that of the third embodiment. Although the part 1 and the part 3 are continuous, the number of recording units is not continuous between the part 1 and the part 3.

  FIG. 16 is a diagram illustrating a correspondence relationship between position designation information (position in video information) and licenses (including number information designating numbers) corresponding to FIG. In the correspondence list 63 illustrated in FIG. 16, the portion 1 is the same as that in the third embodiment. Part 3 starts with relative coordinates m × S and ends at (m−k + n−1) × S.

  FIG. 17 is a diagram for explaining the correspondence between the license and the number information held by the license, corresponding to FIG. In the correspondence list 64 illustrated in FIG. 17, the license L1 is the same as that in the third embodiment. The license L3 has a start position of m × S and an end position of (m−k + n−1) × S.

  FIG. 18 is a diagram for explaining a flow at the time of deletion. The control unit 14 reads position designation information from the removable recording medium 20 via the external input / output I / F 11 (step S41). Next, the license is read in the same manner (step S42). Next, the position designation information is deleted as shown in FIG. At this time, the relative coordinates from the head in the portion after the deletion position are also changed (step S43). Next, the license L4 is deleted as shown in FIG. At this time, the start position and end position in the portion after the deletion position are also changed (step S44). Next, the position designation information is written to the removable recording medium 20 via the external input / output I / F 11 (step S45), and the license is also written (step S46). Finally, the video information is deleted via the external input / output I / F 11 (step S47). As described above, in this embodiment, when deleting any one of the divided parts, the license corresponding to the part to be deleted is deleted at the same time.

  By applying this embodiment, it is possible to delete a license by the simple procedure as described above.

<Fifth Embodiment>
FIG. 19 is a diagram for explaining a flow of reproducing encrypted video information recorded in the first to fourth embodiments. As this embodiment, the reproduction processing of encrypted video information executed in the information recording / reproducing apparatus 10 illustrated in FIG. 1 will be described.

  The control unit 14 acquires position designation information from the removable recording medium 20 via the external input / output I / F 11 (step S51). Next, a license corresponding to the reproduction position is acquired (step S52). Next, the information recording / reproducing apparatus 10 acquires the encrypted video information recorded on the removable recording medium 20 via the buffer 17 (step S53). Next, decryption information is generated and decrypted in the encryption unit 15 including the decryption unit, and the decryption result is written in the buffer 17 (step S54). Details of step S54 will be described later. Next, the decoded video information in the buffer 17 is sent to the reproduction unit 16 (step S55), where the reproduction unit 16 performs a decoding process and outputs a video signal to the display means 19 (step S56).

  The generation of decoding information and the decoding process in step S54 will be described. The encryption unit 15 extracts the generation information described in the first embodiment from the license, and generates an initial vector or encryption key from the number in the same manner as when recording. The encrypted information can be decrypted based on the information recorded in the license and the generated information.

  In this embodiment, the recorded video information is divided into parts, the part is divided into recording units, and a serial number is assigned in the part, so any part can be decoded immediately, Therefore, even when video information or the like is reproduced at random, it can be easily performed. Note that portions not described in the present embodiment can be realized by a method similar to that realized in a digital high-definition recorder.

<Other embodiments>
In the second to fourth embodiments, the division / combination / deletion of the video information is performed for each recording unit. However, the division / combination / deletion can be performed in the middle of the recording unit. For this purpose, a position other than the beginning of the recording unit may be designated as the start position in the position designation information, and a position other than the end of the recording unit may be designated as the end position.

  In the present invention, information usage conditions may be recorded in the license. As information recording conditions, copy control information / usable period / age viewing restriction and the like can be considered. The information recording / reproducing apparatus sets them when information is recorded, and operates according to the use conditions during reproduction. In the present invention, each embodiment has been described by taking video information as an example. However, the present invention is applicable to general information that needs to be encrypted, such as audio information.

  The present invention can also take the form of a recording medium exemplified by the removable recording medium 20 that can be reproduced by the information reproducing apparatus as in the fifth embodiment. In this recording medium (information recording medium), position designation information for designating the position of each part in the information, and number information for designating the number of a recording unit obtained by dividing each part by a predetermined data amount are provided for each part. The included license and the information encrypted with the encryption information generated from the recording unit number are recorded.

  Further, in the information recording / reproducing apparatus or the information recording apparatus / information reproducing apparatus according to the first to fifth embodiments, the embodiment of each component has not been described, but the control unit 14 of FIG. A part or all may be constituted as hardware, or may be constituted by software (firmware incorporated in an information recording / reproducing apparatus) and an arithmetic processing unit for executing the software. Of course, the encryption unit 15 may also be configured by software, but is preferably configured as hardware from the viewpoint of processing speed. Further, as a part that is more preferably configured by software, the license generation unit 14c of FIG. 1 is particularly mentioned, and the division unit 14a and the number assignment unit 14b may also be configured by software.

  Therefore, the present invention can also take the form of a program to be incorporated into an information recording / reproducing apparatus or an information recording / information reproducing apparatus provided with an arithmetic processing unit. Here, the configuration of the control unit for executing this program will be briefly described. The present invention can also adopt a form as a recording medium storing this program.

  FIG. 20 is a diagram for explaining a configuration example of a general control unit. Examples of the control unit 60 include general-purpose / dedicated processors and LSIs, and an input / output I / F including an input unit 75 for inputting data to be processed and an output unit 76 for outputting processed data, and the present invention. A ROM 73 (preferably a rewritable ROM) in which the control program 74 is recorded, a CPU 71 for executing the control program 74, and a RAM 72 as an execution area thereof are the main components, and these are connected by a bus 77. As an example. Information handled by these devices is input from the input unit 75, temporarily stored in the RAM 72 during the processing, then transmitted to the outside via the output unit 76, and read out by the CPU 71 as necessary. Correction / writing is performed.

It is a block diagram which shows the basic structural example of the information recording / reproducing apparatus which concerns on one Embodiment of this invention. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus when recording. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus when dividing. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus when combining. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a figure for demonstrating the outline of the data structure of the information recording medium in this invention. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus when deleting. It is a flowchart for demonstrating an example of the process sequence of the information recording / reproducing apparatus when reproducing | regenerating. It is a figure for demonstrating the structural example of a general control part. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Information recording / reproducing apparatus, 11 ... External input / output I / F, 12 ... Reception part, 13 ... User I / F, 14 ... Control part, 15 ... Encryption part, 16 ... Playback part, 17 ... Buffer, 18 ... Operation input means, 19 ... display means, 20 ... removable recording medium.

Claims (7)

A division unit that divides input information into a plurality of parts and further divides each part into recording units with a predetermined data amount, or divides the entire inputted information into recording units with the predetermined data amount as a part When,
A number assigning unit for assigning consecutive numbers to the recording units in each part;
An encryption unit that generates encryption information using the number assigned by the number assignment unit, and encrypts information included in a recording unit with the encryption information;
A license generation unit for generating a license including number information for designating a number assigned by the number assignment unit;
Encryption information encrypted by the encryption unit for each part divided by the division unit, position designation information for designating the position of each part in the input information, and a license generated by the license generation unit And an output unit that records the information on a recording medium in association with each other.   The information recording apparatus according to claim 1, wherein when each of the parts resulting from dividing the input information by the dividing unit is further divided into a plurality of parts, the part to be divided An information recording apparatus comprising: a license dividing unit that divides licenses corresponding to.   3. The information recording apparatus according to claim 1 or 2, wherein when the adjacent parts among the divided parts are combined, the numbers assigned to the respective parts are consecutive with respect to the adjacent parts. The information recording apparatus further comprises a license combining unit that combines licenses corresponding to the adjacent portions.   4. The information recording apparatus according to claim 1, wherein when deleting any one of the divided parts, the license corresponding to the part to be deleted is deleted at the same time. An information recording apparatus characterized by the above.   A decryption unit that generates and decrypts decryption information from an input unit that retrieves and reads a corresponding license for a predetermined portion of information, and information that specifies a number included in the license And an information reproducing apparatus.   An information recording apparatus comprising an arithmetic processing unit for executably incorporating the information recording apparatus, wherein the information recording apparatus divides input information into a plurality of parts, and further separates each part into a recording unit with a predetermined amount of data. A division step of dividing or dividing the entire inputted information into a recording unit with the predetermined data amount as a part, a number assigning step for assigning a continuous number to the recording unit within each part, and the number assigning step An encryption step for generating encryption information using the number assigned in step 1, and encrypting information included in the recording unit with the encryption information, and a number for specifying the number assigned in the number assignment step A license generation step of generating a license including information, and encryption by the encryption step for each part divided in the division step A predetermined step among encryption information, position designation information that designates the position of each part in the input information, and an output step that records the license generated in the license generation step in association with the recording medium. The program includes a step other than the predetermined step among the dividing step, the number assigning step, the encryption step, the license generating step, and the output step. A program that is executed by a processing device.   6. A recording medium reproducible by the information reproducing apparatus according to claim 5, wherein the position designation information for designating the position of each part in the information, and the recording unit in which each part is divided by a predetermined data amount with respect to each part. A recording medium in which a license including number information for designating a number and information encrypted with encryption information generated from a recording unit number is recorded.

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