CN100592771C - Digital film playing system with the DVI output content protection - Google Patents

Abstract

The invention discloses a digital movies playing system adopting DVI interface as video output port and having output content protection, composed of a player connected through DVI connecting cable toa display unit, where the player comprises kernel chip module and DVI interface module, interconnected through I2C bus; and the display unit contains a mark storage board which is connected with theDVI interface module through I2C module. And the player outputs DVI digital video signal only to a legal display unit so as to prevent illegal users from directly copying and pirating from DVI interfaces through other devices, and conveniently and reliably implementing content protection at the DVI output end of a digital movies player, convenient, reliable and low-cost.

Description

A kind of digital cinema playback system with DVI output content protection

Technical field

The present invention relates to a kind of digital cinema playback system, the particularly a kind of DVI of employing interface is as video output terminals and have the digital cinema playback system of output content protection.

Background technology

Digital movie is the product that the traditional film industry combines with digital technology, just progressively demonstrates the great development potentiality.Digital movie is compared the conventional film film and is possessed lot of advantages, and it can provide the picture of high-quality, high definition, significantly reduces cost, and makes more conveniently, and more remarkable effect copies undampedly, and fail safe is higher and more flexible.The film digitlization is the inexorable trend of film development, and at present, the digital development process is being accelerated in countries in the world, actively sets up film science and technology new system, and various digital movie players are also along with the digitized process of film is arisen at the historic moment.

DVI (Digital Visual Interface, digital visual interface) be to form the interface standard that DDWG (Digital Display WorkingGroup, numeral show working group) releases jointly by companies such as Silicon Image, Intel (Intel), Compaq (Compaq), IBM in 1999.It is based on the PanalLink interfacing of Silicon Image company, adopt TMDS (Transition Minimized Differential Signaling, transition minimized differential signaling) electronic protocol is as being electrically connected substantially, transmission speed is up to about 8GBPS (165MHZx24bitx2), be fit to transmission and do not have compression, high definition video signal, the highlyest support that (resolution: 2048x1536) form becomes the standard interface of digital movie player, HDTV (High-Definition Television) etc. to QXGA.

DVI interface output uncompressed video digital signal makes it must face output content Copyright Protection, particularly film industry, and it is pirate to prevent that the disabled user from directly copying record to movie by the DVI interface.HDCP (the High-bandwidth Digital Content Protection that Intel Company formulates; the wide band digital content protecting) be present DVI interface effective output content protection scheme of extensively adopting; but adopt this scheme to need in equipment, to install additional special-purpose HDCP chip; and the expensive expense of need: 15; 000 dollar annuity; every group of secret key do not coexist between the 0.5-10 cent according to every single order quantity, and high cost has limited the use of HDCP greatly.

For this reason, people wish the digital cinema playback system that a kind of convenience arranged, realize the DVI output content protection cheaply, reliably.

Summary of the invention

The objective of the invention is to lack output content protection, and existing guard method problem with high costs provides a kind of based on general I at the DVI interface ²The digital cinema playback system with DVI output content protection of C bus standard.

To achieve the above object of the invention, the present invention takes following technical scheme.

A kind of digital cinema playback system with DVI output content protection as shown in Figure 1, is connected to display device 11 by player 10 by DVI connecting line 16 and forms, and described player 10 comprises between an acp chip module 12 and the DVI interface module 13 and passes through I ²The C bus connects; It is characterized in that sign memory plane 14 is contained in described display device 11 inside, described sign memory plane 14 passes through I ²The C bus is connected with the 2nd DVI interface module 15;

Whether described acp chip module 12 can read the identification information of sign memory plane 14 stored, be legitimate device according to identification information judgment.

Further, described sign memory plane 14 comprises that a memory device 20 is connected by the I2C bus with an external interface module 21.

Further, described memory device 20 comprises nonvolatile semiconductor memory member.

Further, store identification information in the described memory device 20, i.e. id information, this identification information are that the producer that obtains publisher's legal authorization before being dispatched from the factory by equipment writes.

Further, described memory device 20 is sealed on the integrated circuit board such as with insulation solidifiable glue memory device being covered by physical protection.

Further, the executive program that in described player 10, prestores, this program realizes the DVI output content protection, concrete steps are as follows:

Step 100 user plays by the film that the man-machine interface of player is selected to watch;

After step 200 player receives user's " broadcast " instruction, to the non-volatile memory device 20 transmission I of sign memory plane 14 ²C reads instruction, and reads the equipment identification information of storing in this device;

Step 300 player judges the identification information that reads, if identification information mistake or read less than identification information thinks that then DVI interface institute coupling device is an illegality equipment, jumps to step 400; If identification information is correct, judge that then DVI interface institute connection device is a legal display, jump to step 500;

Step 400 provides the abnormal prompting of subscriber equipment, withdraws from broadcast state then, and then the DVI interface does not have the output of film video signal;

Step 500 provides subscriber equipment and points out normally, enters the normal movie broadcast state then, DVI interface output normal digital vision signal.

Compared with prior art, advantage of the present invention is:

1) player is only exported the DVI digital video signal to legal display, thereby it is pirate to prevent that the disabled user from directly copying record by miscellaneous equipment from the DVI interface, has cheaply realized the content protecting of digital movie player DVI output reliably;

2) the present invention is convenient and reliable and with low cost.

Description of drawings

The structural representation of Fig. 1 digital cinema playback system of the present invention;

The structural representation of sign memory plane in Fig. 2 digital cinema playback system of the present invention;

The flow chart of Fig. 3 Play Control of the present invention.

Embodiment

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:

See figures.1.and.2 and realize digital cinema playback system of the present invention, wherein, hardware device comprises player 10 and display device 11, the decoding that player 10 is used for digital film play and with vision signal by the output of DVI interface, display device 11 is used for vision signal with player output and finally projects on the motion picture screen and watch for the user.Be communicated with by DVI connecting line 16 between two equipment.Hardware system constitutes as shown in Figure 1.

Player 10 inside comprise an acp chip module 12 and a DVI interface module 13, and the former is the nucleus module that the film decoding is play, and the latter is the video output interface module, the I of acp chip module 12 ²The C bus is connected to a DVI interface module 13.Display device contains sign memory plane 14 and the 2nd DVI interface module 15, interface module 15 is used for the input of vision signal, and sign memory plane 14 is key equipment modules of native system, is positioned at the legal display inside of publisher's appointment, has use I on the memory plane ²The nonvolatile semiconductor memory member module 20 of C bus; preserve the ID identification information of equipment in this module; this id information is write by the producer that obtains publisher's legal authorization before equipment dispatches from the factory; and memory device wherein carried out physical protection; using insulation silica gel that memory device is covered is sealed on the integrated circuit board; this device can't directly be dismantled to be read; guarantee that id information is not stolen; those skilled in the art should be understood that this physical protection can also take other modes, are that those skilled in the art are adequate.Memory plane also comprises external interface module 21 so that be connected intercommunication with other integrated circuit board in addition, reaches supply module 22 and is used for the integrated circuit board power supply, and sign memory plane 14 structures as shown in Figure 2.

Pass through I between player 10 and the memory plane 14 ²The C bus is carried out information exchange.I ²The C bus is the chip chamber serial transmission bus that PHILIPS company releases, and is simple and reliablely adopted by vast electronic product manufacturer with it, has become a kind of general bus interface standards, and total line length can reach 7 meters, and transmission speed reaches as high as 400kbps.I ²The C bus adopts serial communication mode, is made up of a clock line (SCL) and a data lines (SDA), and clock line is responsible for controlling read-write sequence and is carried out information data transmission on the data wire.In the present embodiment, the I of player acp chip module 12 ²The C pin is connected on the idle pin that DVI interface 13 do not use, and the I of memory device 20 on the sign memory plane 14 ²The C pin is connected to the idle pin of corresponding display device DVI interface 15, by the DVI interface line, player acp chip module 12 is connected with memory device 20, makes both can carry out I ²The C communication; thereby acp chip module 12 can read the ID identification information of memory device 20 inside to be judged, has only the legitimate device that is that judgement connects, and just understands outputting video signal to the DVI interface; otherwise it is, pirate thereby protection DVI output content can not copied record by illegality equipment with no-output.

In conjunction with Fig. 3, player 10 realizes that with sign memory plane 14 cooperatings the step of DVI output content protection is as follows:

Step 100 user plays by the film that the man-machine interface of player is selected to watch;

After step 200 player receives user's " broadcast " instruction, to the non-volatile memory device transmission I of sign memory plane ²C reads instruction, and reads the device id information of storing in this device;

Step 300 player judges the id information that reads, if id information mistake or read less than id information thinks that then DVI interface institute coupling device is an illegality equipment, jumps to step 400; If id information is correct, judge that then DVI interface institute connection device is a legal display, jump to step 500;

Step 400 provide user prompt as: " with the display device Communications failure, please more exchange device or check to connect ", after withdraw from broadcast state, the DVI interface does not have the output of film video signal;

Step 500 provides user prompt as " normal with the display device communication, begin play ", after enter the normal movie broadcast state, DVI interface output normal digital vision signal.

By above hardware device and software approach process; guarantee that player is only to legal display output DVI digital video signal; thereby it is pirate to prevent that the disabled user from directly copying record by miscellaneous equipment from the DVI interface, has cheaply realized the content protecting of digital movie player DVI output reliably.

It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1, a kind of digital cinema playback system with DVI output content protection, this system is connected to display device (11) by player (10) by DVI connecting line (16) and forms, described player (10) comprises an acp chip module (12) and a DVI interface module (13), connects by the I2C bus between them; It is characterized in that sign memory plane (14) is contained in described display device (11) inside, described sign memory plane (14) is connected with the 2nd DVI interface module (15) by the I2C bus;

Whether described acp chip module (12) can read the identification information of sign memory plane (14) stored, be legitimate device according to identification information judgment.

According to the described digital cinema playback system of claim 1, it is characterized in that 2, described sign memory plane (14) comprises a nonvolatile semiconductor memory member module (20) and an external interface module (21), passes through I between them with DVI output content protection ²The C bus connects.

3, according to the described digital cinema playback system of claim 2, it is characterized in that having use I on the described sign memory plane (14) with DVI output content protection ²The nonvolatile semiconductor memory member module (20) of C bus; preserve the ID identification information of equipment in the described nonvolatile semiconductor memory member module (20); this id information is write by the producer that obtains publisher's legal authorization before equipment dispatches from the factory, and memory device is wherein carried out physical protection.

4, according to the described digital cinema playback system of claim 1, it is characterized in that with DVI output content protection, the executive program that in described player (10), prestores, this program realizes the DVI output content protection, comprises that specifically step is as follows:

Step 100 user plays by the film that the man-machine interface of player is selected to watch;

After step 200 player receives user's " broadcast " instruction, to non-volatile memory device (20) the transmission I of sign memory plane (14) ²C reads instruction, and reads the equipment identification information of storing in this device;

Step 300 player judges the identification information that reads, if identification information mistake or read less than identification information thinks that then DVI interface institute coupling device is an illegality equipment, jumps to step 400; If identification information is correct, judge that then DVI interface institute connection device is a legal display, jump to step 500;

Step 400 provides the abnormal prompting of subscriber equipment, withdraws from broadcast state then, and then the DVI interface does not have the output of film video signal;

Step 500 provides subscriber equipment and points out normally, enters the normal movie broadcast state then, DVI interface output normal digital vision signal.

Images