CN103778351A - Display system and display method - Google Patents

Abstract

The invention provides a display system and a display method, wherein the system comprises: a processor, configured to decrypt a first encrypted video stream with a first encryption and decryption standard to obtain a first video stream, and encrypt the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; a graphics processor; a USB display device; the storage unit comprises a first driving program and a second driving program; and a chipset; the processor executes the first driving program to decrypt the second encrypted video stream to obtain a second video stream; the graphics processor and the first driving program decode the second video stream to obtain first video data; the processor executes the second driving program, encrypts the decoded first video data to obtain encrypted video data, and transmits the encrypted video data to the USB display device; the USB display device also decrypts the encrypted video data to obtain second video data, and plays the second video data on the display. The invention can play the video content with content protection by using the USB display device.

Description

Display system and display method

technical field

The invention relates to a display system, in particular to a display system and a display method for playing video content with content protection by using a USB display device.

Background technique

Among the many interfaces used in personal computers and notebook computers, the USB (Universal Serial Bus) interface is the most successful and widely used one. In the current specification of the USB interface, the application of audio and video is not specifically defined, especially audio/video data with content protection (such as digital rights management (DRM)). For example, the content of the Blu-ray disc is encrypted using the encryption and decryption standard of the Advanced Access Content System (AACS), so as to protect the audio/video content. In traditional display systems, the graphics processor's driver can only transfer the resulting raw video data to the display card. The processor will further determine whether the display card outputs through an analog display interface (such as VGA, DSUB interface) or a digital display interface with data protection (such as HDMI, DisplayPort or DVI). Video files with content-protected high-definition resolution (such as Full High Definition) can only be output through a digital display interface to have the original high-definition resolution. If they are output through an analog display interface, the original high-definition resolution must be converted. The quality resolution is downscaled to the standard definition (Standard Definition).

Therefore, under the limitations of the software/hardware architecture of the current computer system, if users want to play video data with content protection, users often cannot play video or audio with content protection (such as DHCP) through an external USB display card. Therefore, there is an urgent need for a display system that can play video content with content protection by using a USB display device.

Contents of the invention

In view of this, in order to solve the problems of the prior art, the present invention provides a display system, including: a processor, used to decrypt a first encrypted video stream using a first encryption and decryption standard to obtain a first video stream, and encrypt the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; a graphics processor; a USB display device; a storage unit, including a first driver and a second driver program; and a chipset; wherein the processor executes the first driver program to decrypt the second encrypted video stream to obtain a second video stream; wherein the graphics processor and the first driver program decode the second video stream to obtain a first video stream A video data; wherein the processor also executes the second driver, encrypts the decoded first video data to obtain an encrypted video data, and transmits the encrypted video data to the USB display device; wherein the USB display device is more encrypted The video data is decrypted to obtain a second video data, and the obtained second video data is played on a display.

The present invention also provides a display system, including: a processor, including a first core and a second core, wherein the first core is used to decrypt a first encrypted video stream using a first encryption and decryption standard to Obtain a first video stream, and encrypt the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; a USB display device; a storage unit, including a first driver of the second core program and a second driver of the USB display device; and a chipset coupled to the processor, the USB display device and the storage unit; wherein the first core executes the first driver to encrypt the second The video stream is decrypted to obtain a second video stream; wherein the second core and the first driver program decode the second video stream to obtain a first video data; wherein the first core also executes the second driver program , encrypting the decoded first video data to obtain encrypted video data, and transmitting the encrypted video data to the USB display device; wherein the USB display device further decrypts the encrypted video data to obtain a second video data, and play the obtained second video data on a display.

The present invention also provides a display system, including: a processor, including a first core and a second core, wherein the first core is used to decrypt a first encrypted video stream using a first encryption and decryption standard to Obtain a first video stream, and encrypt the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; a USB display device; a storage unit, including a first driver of the second core program and a second driver of the USB display device; and a platform hub controller coupled to the processor, the USB display device and the storage unit; wherein the first core executes the first driver to the The second encrypted video stream is decrypted to obtain a second video stream, wherein the second core and the first driver decode the second video stream to obtain a video data, wherein the first core also executes the second driver The program encrypts the decoded first video data to obtain encrypted video data, and transmits the encrypted video data to the USB display device; wherein the USB display device further decrypts the encrypted video data to obtain a first video data Two video data, and play the obtained second video data on a display.

The present invention also provides a display method for a display system, the display system includes: a processor, a graphics processor, a USB display device, a storage unit and a chipset, wherein the storage unit includes the graphics processing A first driver program of the USB display device and a second driver program of the USB display device, and the chipset is coupled to the processor, the graphics processor, the USB display device and the storage unit, and the method includes: using the The processor decrypts a first encrypted video stream with a first encryption and decryption standard to obtain a first video stream, and encrypts the first video stream with a second encryption and decryption standard to obtain a second encrypted video stream; Utilize the processor to execute the first driver to decrypt the second encrypted video stream to obtain a second video stream; use the graphics processor and the first driver to decode the second video stream to obtain a first video data; use the processor to execute the second driver, encrypt the decoded first video data to obtain an encrypted video data, and transmit the encrypted video data to the USB display device; use the USB display device Decrypting the encrypted video data to obtain a second video data; and using the USB display device to play the obtained second video data on a display.

The present invention also provides a display method for a display system, the display system includes: a processor, a USB display device, a storage unit and a chipset, wherein the processor includes a first core and a second core, the storage unit includes a first driver of the second core and a second driver of the USB display device, and the chipset is coupled to the processor, the USB display device and the storage unit, the method Including: using the first core to decrypt a first encrypted video stream using a first encryption and decryption standard to obtain a first video stream, and encrypting the first video stream with a second encryption and decryption standard to obtain a first video stream Two encrypted video streams; use the first core to execute the first driver program to decrypt the second encrypted video stream to obtain a second video stream; use the second core and the first driver program to perform the second video stream Decoding to obtain a first video data; using the first core to execute the second driver, encrypting the decoded first video data to obtain encrypted video data, and sending the encrypted video data to the USB display device; using the USB display device to decrypt the encrypted video data to obtain a second video data; and using the USB display device to play the obtained second video data on a display.

The present invention also provides a display method for a display system, the display system includes: a processor, a USB display device, a storage unit, a memory unit and a platform control hub, wherein the processor includes a first core, a second core and an integrated memory controller, the storage unit includes a first driver of the second core and a second driver of the USB display device, and the chipset is coupled to the processor, For the USB display device and the storage unit, the method includes: using the first core to decrypt a first encrypted video stream using a first encryption and decryption standard to obtain a first video stream, and using a second encryption and decryption standard Encrypting the first video stream to obtain a second encrypted video stream; using the first core to execute the first driver to decrypt the second encrypted video stream to obtain a second video stream; using the second core and the The first driver program decodes the second video stream to obtain a first video data; utilizes the first core to execute the second driver program, and encrypts the decoded first video data to obtain encrypted video data, and transmitting the encrypted video data to the USB display device; using the USB display device to decrypt the encrypted video data to obtain a second video data; and using the USB display device to play the obtained second video on a display data.

The technical scheme of the invention can utilize the USB display device to play video content with content protection.

Description of drawings

FIG. 1 is a functional block diagram showing a display system 100 according to an embodiment of the present invention.

FIG. 2A is a functional block diagram showing a display system 200A according to another embodiment of the present invention.

FIG. 2B is a functional block diagram showing a display system 200B according to yet another embodiment of the present invention.

FIG. 3 is a schematic diagram showing the software/hardware architecture of the display system 100 according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a display method for the display system 100 according to an embodiment of the invention.

FIG. 5 is a flowchart showing a display method for the display systems 200A and 200B according to another embodiment of the present invention.

[Description of main reference signs]

100, 200A, 200B～display system;

110, 210A, 210B～processor;

120, 220B ~ graphics processor;

130, 230A～chipset;

131, 231A～Northbridge chip;

132, 232A ~ south bridge chip;

133～internal bus;

140～the first memory unit;

150～second memory unit;

160, 260A, 260B～storage unit;

161, 261A, 261B～operating system;

162, 262A, 262B ~ the first driver;

163, 263A, 263B ~ the second driver;

164, 264A, 264B～media files;

170, 270A, 270B ~ USB display device;

180～external CD-ROM drive;

211A, 211B ~ the first core;

212A, 212B～the second core;

213B～integrated memory controller;

240A, 240B, 250B-memory unit;

290～platform control hub;

310-350~ stage.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, a preferred embodiment will be described in detail below together with the accompanying drawings.

FIG. 1 is a functional block diagram showing a display system according to an embodiment of the invention. The display system 100 includes a processor 110 , a graphics processor 120 , a chipset 130 , a first memory unit 140 , a second memory unit 150 , a storage unit 160 and a USB display device 170 . The chipset 130 acts as a connection bridge between various components in the display system 100 . For example, the chipset 130 may include a north bridge chip 131 and a south bridge chip 132 , and the north bridge chip 131 and the south bridge chip 132 are connected through an internal bus 133 . The north bridge chip 131 is used to connect components with higher operating frequency, such as the processor 110 , the graphics processor 120 and the first memory unit 140 (such as the system memory). The south bridge chip 132 is used to connect components with low operating frequency (such as PCI devices) and input/output peripheral devices, such as the USB display device 170 , or external playback devices (such as BluRay disc players).

In one embodiment, the display system 100 may optionally include an external optical disk drive 180 . The external optical disc drive 180 is coupled to the south bridge chip 132 for playing audio/video data with content protection (such as AACS encryption).

The first memory unit 140 is a system memory. When the processor 110 decrypts video data with content protection (such as CSS or AACS), the audio/video temporary storage data (such as audio stream and video stream) obtained after decryption will be stored in the first memory unit first 140 in. The second memory unit 150 is a graphics memory dedicated to the graphics processor 120 for storing graphics data or decoded video data of the graphics processor 120 .

The storage unit 160 stores an operating system 161 , a first driver 162 and a second driver 163 . The processor 110 executes the operating system 161 as an operating platform. The first driver 162 is a dedicated driver for the graphics processor 120, which can decrypt video data with content protection (such as an H.264 video stream encrypted with the AES standard) and decode the video stream (such as H. .264 video stream). The second driver 163 is a dedicated driver for the USB display device 170 (also known as a hook driver (hook driver)), which is used to obtain the decoded video data from the second memory unit 150 through the graphics processor 120, and transmit it on the USB The acquired video data is played on the display device 170 .

In another embodiment, the storage unit 160 can also selectively store the media file 164 with content protection. The processor 110 can store the media file 164 with content protection (such as AACS encryption) in the storage unit 160 and perform data protection decoding (decryption).

FIG. 2A is a functional block diagram showing a display system 200A according to another embodiment of the present invention. Please refer to FIG. 1 and FIG. 2A at the same time. The functions of some components in the display system 200A are the same as those in the display system 100, such as the chipset 230A (including the north bridge chip 231A and the south bridge chip 232A), the storage unit 260A (including the operating system 261A). , the first driver 262A and the second driver 263A) and the USB display device 270A. The difference between the display system 200A and the display system 100 is that the processor 210A includes a first core 211A and a second core 212A, wherein the function of the first core 211A is the same as that of the processor 110, and the function of the second core 212A is the same as that of the graphics processor 120 is the same. In other words, the processor 210A integrates the functions of a general processor and a graphics processor (such as an IntelCore 2 Duo processor), and the processor 210A uses an integrated memory architecture (UnifiedMemory Architecture), which means that the first core 211A and the second core The core 212A accesses data using the memory unit 240A. In more detail, the memory unit 240A is not only a system memory, but also a graphics memory.

FIG. 2B is a functional block diagram showing a display system 200B according to yet another embodiment of the present invention. Please refer to FIG. 2A and FIG. 2B at the same time. The functions of some components in the display system 200B are the same as those in the display system 200A, such as the storage unit 260B (including the operating system 261B, the first driver 262B and the second driver 263B) and USB display device 270B. The difference between the display system 200B and the display system 200A is that the display system 200B uses a platform control hub (PlatformControl Hub, PCH) 290 to replace some functions (such as real-time clock) and the south bridge chip of the North Bridge chip 231A in the original display system 200A. All functions of 232A, and processor 210B is connected with platform control hub 290 through a direct media interface (Direct Media Interface, DMI). Processor 210B (such as Intel i3, i5, i7 processors), which includes a first core 211B, a second core 212B and an integrated memory controller 213B, wherein the functions of the first core 211B and the second core 212B are respectively the same as those of the first core 212B The first core 211A and the second core 212A are the same. It should be noted that the memory unit 240B in the display system 200B is directly electrically connected to the integrated memory controller in the processor 210B, and the memory unit 240B also uses an integrated memory architecture (Unified Memory Architecture) for the first core 211B ( The general processing operation core) and the second core 212B (graphics processing core) access the data in the memory unit 240B through the integrated memory controller 213B.

For the present invention, regardless of the display system 100 , 200A or 200B, the USB display device can play a video file with high quality and resolution with content protection. For ease of description, the embodiments described later take the display system 100 in FIG. 1 as an example. Those of ordinary skill in the art can understand that the operation of the display system 100 of the present invention can be applied to the display systems 200A and 200B.

FIG. 3 is a schematic diagram showing the software/hardware architecture of the display system 100 according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 3 at the same time. The software/hardware processing flow of the display system 100 (or the display systems 200A, 200B) can be roughly divided into five stages 310-350. Stage 310 may also be referred to as a user mode unprotected infrastructure (User mode unprotected infrastructure). For example, in stage 310, the display system 100 can play video files with content protection (such as AACS encryption) through playing software (such as Power DVD, Media Player, etc.). Next, the processor 110 decrypts the video content with content protection (including the first encrypted audio stream and the first encrypted video stream), and enters stage 320 .

The stage 320 can also be referred to as a user mode protected infrastructure (User mode protected infrastructure). The processor 110 stores the first audio stream (such as stereo or Dolby encoding) and the first video stream (such as H.264 video stream) obtained after decryption in the first memory unit 140, and then stores the first audio stream and the first The video stream is encrypted using another data encryption technology (such as AES, 3AES) to obtain a second encrypted audio stream and a second encrypted video stream, and the second encrypted audio stream and the second encrypted video stream are respectively sent to the corresponding audio device (such as a sound card) and graphics processor 120, and enter stage 330. Note that in video content (such as BluRay discs) with content protection (such as AACS), the audio signal is relatively unrestricted, and the audio device can decrypt the second encrypted audio stream after receiving the second encrypted audio stream. Obtain the second audio stream, and then decode the second audio stream to obtain the original audio data, which can be played.

Stage 330 can also be called as Drivers Kernel Mode Protected Environment (Drivers Kernel Mode Protected Environment). In stage 330, the first driver 162 of the graphics processor 120 decrypts the second encrypted video stream to obtain a second video stream, and the graphics processor 120 and/or the first driver 162 decodes the second video stream to obtain Get raw video data. In the hardware/software architecture of the display system 100 , after the graphics processor 120 decodes the decrypted video stream, the obtained original video data is stored in the second memory unit 150 . It should be noted that the original video data transmitted in the above data path is not encrypted. At this moment, the second driver program 163 of the USB display device 170 sends a request signal to the first driver program 162, thereby requiring the first driver program 162 to transmit unprotected original video data to the second driver program 163 through the graphics processor 120 , and enter stage 340 .

It should be noted that the stages 310-320 are all part of the software, which means that the processor 110 is used to perform related encryption and decryption operations. The graphics processor 120 also has a dedicated hardware circuit (such as an H.264 decoder) to decode the video stream, but still needs to be controlled by the first driver 162 for operation. More specifically, in the kernel mode in stage 330 , the first driver 162 utilizes the processor 110 and the GPU 120 to decode the video stream (eg, H.264 video stream). In other words, both the graphics processor 120 and the first driver can be used to decode the video stream.

In stage 340 , the second driver 163 encrypts the raw video data from the first driver 162 using the processor 110 (for example, using AES encryption), and transmits the encrypted raw video data to the USB display device 170 . The USB display device 170 then decodes the received encrypted original video data, and transmits the decoded original video data to a display (not shown) through an analog display interface or a digital display interface, and enters stage 350 . Because the USB display device 170 can decrypt the received encrypted original video data to obtain the original video data, no matter whether the USB display device 170 plays the original video data on the display through the analog display interface or the digital display interface, it will not be restricted. This means that it is not necessary to downscale the high-resolution images. In stage 350 , the display can directly play the raw video data from the USB display device 170 . Those of ordinary skill in the art should understand that the present invention can also select the traditional way to decode the video stream through the graphics processor 120 or its first driver 162 to obtain video data, and the graphics processor 120 can use the analog display interface (for those with Content-protected high-definition video content, the resolution needs to be downscaled) or digital display interface to play video data on the display.

FIG. 4 is a flowchart showing a display method for the display system 100 according to an embodiment of the invention. Please refer to Figure 1 and Figure 1 at the same time. In step S410, the processor 110 decrypts a first encrypted video stream using a first encryption and decryption standard (for example, AACS Advanced Access Content System encryption and decryption standard) to obtain a first video stream (for example, H.264 video stream) , and encrypt the first video stream with a second encryption and decryption standard (such as AES Advanced Encryption and Decryption Standard) to obtain a second encrypted video stream. In step S420, the processor 110 executes the first driver 162 to decrypt the second encrypted video stream to obtain a second video stream (eg, H.264 video stream). In step S430, the graphics processor 120 and the first driver 162 decode the second video stream to obtain video data. In step S440 , the second driver 163 encrypts the decoded video data through the processor 110 to obtain encrypted video data, and transmits the encrypted video data to the USB display device 170 . In step S450, the USB display device 170 decrypts the received encrypted video data to obtain original video data. In step S460, the USB display device 170 can play the decrypted video data on a display.

FIG. 5 is a flowchart showing a display method for the display system 200A or 200B according to another embodiment of the present invention. Please refer to FIG. 2 and FIG. 5 at the same time. In this embodiment, the display system 200A is taken as an example for illustration. Those skilled in the art can understand how to apply the operation of the display system 200A to the display system 200B. In step S510, the first core 211A of the processor 210A decrypts a first encrypted video stream using a first encryption and decryption standard (such as the AACS Advanced Access Content System encryption and decryption standard) to obtain a first video stream (such as H .264 video stream), and encrypt the first video stream with a second encryption and decryption standard (such as AES Advanced Encryption and Decryption Standard) to obtain a second encrypted video stream. In step S520, the first core 211A of the processor 210A executes the first driver 262A to decrypt the second encrypted video stream to obtain a second video stream (eg, H.264 video stream). In step S530, the second core 212A and the first driver 262A of the processor 210A decode the second video stream to obtain a video data. In step S540 , the second driver encrypts the decoded video data through the first core 211A of the processor 210A to obtain encrypted video data, and transmits the encrypted video data to the USB display device 270A. In step S550, the USB display device 270A decrypts the received encrypted video data to obtain video data. In step S560, the USB display device 270A can play the decrypted video data on a display.

It should be noted that the flow of the display method in FIG. 4 and FIG. 5 only describes how the display system 100 and 200A/200B play the video content with content protection through the USB display device. The data paths of unprotected video streams or original video data in the display systems 100 and 200A/200B have been disclosed in the foregoing embodiments, and will not be repeated here.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore The scope of protection of the present invention should be determined by the scope defined by the appended claims.

Claims (10)

1. a display system, comprising:

One processor, in order to one first encrypted video stream with one first encryption and decryption standard is deciphered to obtain one first video flowing, and encrypts to obtain one second encrypted video stream with one second encryption and decryption standard to this first video flowing;

One graphic process unit;

One USB display device;

One storage element, comprises one first driver of this graphic process unit and one second driver of this USB display device; And

One chipset, is coupled to this processor, this graphic process unit, this USB display device and this storage element;

Wherein this processor is carried out this first driver this second encrypted video stream is deciphered to obtain one second video flowing;

Wherein this graphic process unit and this first driver decode to obtain one first video data to this second video flowing;

Wherein this processor is also carried out this second driver, this first video data of decoding gained is encrypted to obtain an enciphered video data, and this enciphered video data is sent to this USB display device;

Wherein this USB display device is also decrypted to obtain one second video data to this enciphered video data, and plays in a display this second video data obtaining.

2. display system as claimed in claim 1, wherein this first video flowing is stored in a first memory unit of this display system.

3. display system as claimed in claim 1, is wherein decrypted this obtained first video data to this second video flowing and is stored in the second memory unit that this graphic process unit is used.

4. a display system, comprising:

One processor, comprise one first core and one second core, wherein this first core is in order to one first encrypted video stream with one first encryption and decryption standard is deciphered to obtain one first video flowing, and with one second encryption and decryption standard, this first video flowing encrypted to obtain one second encrypted video stream;

One USB display device;

One storage element, comprises one first driver of this second core and one second driver of this USB display device; And

One platform line concentration controller, is coupled to this processor, this USB display device and this storage element;

Wherein this first core is carried out this first driver this second encrypted video stream is deciphered to obtain one second video flowing;

Wherein this second core and this first driver decode to obtain a video data to this second video flowing;

Wherein this first core is also carried out this second driver, this first video data of decoding gained is encrypted to obtain an enciphered video data, and this enciphered video data is sent to this USB display device;

Wherein this USB display device is also decrypted to obtain one second video data to this enciphered video data, and plays in a display this second video data obtaining.

5. display system as claimed in claim 4, also comprises:

One memory cell, wherein this processor also comprises that an integration Memory Controller is electrically connected at this memory cell, in order to allow the data access of this first core and this this memory cell of the second core control, wherein this first video flowing is stored in this memory cell.

6. display system as claimed in claim 4, also comprises:

One graphic process unit; And

One second memory unit, is electrically connected at this graphic process unit, and wherein this second core and this graphic process unit also can together decode to obtain this first video data to this second video flowing.

7. display system as claimed in claim 6, is wherein decrypted this obtained first video data to this second video flowing and is stored in this memory cell.

8. a display packing, for a display system, this display system comprises: a processor, a graphic process unit, a USB display device, a storage element and a chipset, wherein this storage element comprises one first driver of this graphic process unit and one second driver of this USB display device, and this chipset is coupled to this processor, this graphic process unit, this USB display device and this storage element, and the method comprises:

Utilize this processor to decipher to obtain one first video flowing to one first encrypted video stream with one first encryption and decryption standard, and with one second encryption and decryption standard, this first video flowing is encrypted to obtain one second encrypted video stream;

Utilize this processor to carry out this first driver this second encrypted video stream is deciphered to obtain one second video flowing;

Utilize this graphic process unit and this first driver to decode to obtain one first video data to this second video flowing;

Utilize this processor to carry out this second driver, this first video data of decoding gained is encrypted to obtain an enciphered video data, and this enciphered video data is sent to this USB display device;

Utilize this USB display device to be decrypted to obtain one second video data to this enciphered video data; And

Utilize this USB display device to play this second video data obtaining in a display.

9. a display packing, for a display system, this display system comprises: a processor, a USB display device, a storage element and a chipset, wherein this processor comprises one first core and one second core, this storage element comprises one first driver of this second core and one second driver of this USB display device, and this chipset is coupled to this processor, this USB display device and this storage element, and the method comprises:

Utilize this first core to decipher to obtain one first video flowing to one first encrypted video stream with one first encryption and decryption standard, and with one second encryption and decryption standard, this first video flowing is encrypted to obtain one second encrypted video stream;

Utilize this first core to carry out this first driver this second encrypted video stream is deciphered to obtain one second video flowing;

Utilize this second core and this first driver to decode to obtain one first video data to this second video flowing;

Utilize this first core to carry out this second driver, this first video data of decoding gained is encrypted to obtain an enciphered video data, and this enciphered video data is sent to this USB display device;

Utilize this USB display device to be decrypted to obtain one second video data to this enciphered video data; And

Utilize this USB display device to play this second video data obtaining in a display.

10. a display packing, for a display system, this display system comprises: a processor, a USB display device, a storage element, a memory cell and a platform control hub, wherein this processor comprises one first core, one second core and an integration Memory Controller, this storage element comprises one first driver of this second core and one second driver of this USB display device, and this chipset is coupled to this processor, this USB display device and this storage element, and the method comprises:

Utilize this first core to decipher to obtain one first video flowing to one first encrypted video stream with one first encryption and decryption standard, and with one second encryption and decryption standard, this first video flowing is encrypted to obtain one second encrypted video stream;

Utilize this first core to carry out this first driver this second encrypted video stream is deciphered to obtain one second video flowing;

Utilize this second core and this first driver to decode to obtain one first video data to this second video flowing;

Utilize this first core to carry out this second driver, this first video data of decoding gained is encrypted to obtain an enciphered video data, and this enciphered video data is sent to this USB display device;

Utilize this USB display device to be decrypted to obtain one second video data to this enciphered video data; And

Utilize this USB display device to play this second video data obtaining in a display.

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