CN1110923C - Manufacturing method of video CD disk with sequencial reproducing - Google Patents

Abstract

The present invention relates to a manufacturing method of a video CD played orderly. Firstly, playing-forcibly content segments are prepared; video contents which need to be played are divided into corresponding segments, the order is recorded, and each video segment is encrypted, so that one playing-forcibly content which need to be corresponds to one of the video segments encrypted; all playing-forcibly files and all corresponding encrypted files are combined according to the order of the video segments to form the playing-orderly video CD of the present invention. The orderly playing of the video CD can be achieved by the method. Other contents required by users only can be played after specific segments are normally played.

Description

A kind of manufacture method that the video display CD of played in order is arranged

Technical field

The present invention relates to a kind of manufacture method that the video display CD of played in order is arranged, belong to DVD, Digital Television, cross media publishing technical field.

Background technology

For preventing piracy; when formulating digital video disk (hereinafter to be referred as DVD) standard; considered a lot of guard methods, mainly contain several, i.e. area code, encrypted sector, image EIC equipment identification code out of order and that on computer DVD hardware, use, analog encryption method etc.

1) analog encryption method simulation anti-copying system (Analog CPS)

Be mainly used in and prevent that analog vtr from duplicating, its representative is Mike's prestige company 7.0 versions, and it is by adding the look pulse signal in the vertical barnyard in the video signal of output, to upset synchronously, makes the common video tape recorder can't operate as normal to sort signal.But this method can make the quality of image descend.

2) image is out of order

So-called image is out of order, and the initial data that is meant DVD is through Content Scrambling System (hereinafter to be referred as CSS) coding, in the hope of reaching the purpose of encryption.CSS is a kind of data ciphering method known to a person of ordinary skill in the art, is used for stoping directly not reading multimedia file from CD when having decruption key.In order to make the randomization of image file, be with the key of 5 bytes (40bit).Every kind of player comprises the controller that Sony, Toshiba and other consumer appliances manufacturers bear, and the supplier who is used for (as WinDVD, ATIDVD) this class software of computer, and own unique decryption key is all arranged.Every DVD disc has been printed 400 5 keys in the above in order.Like this, can read CD with each key of obtaining the authorization, and no matter it belongs to WinDVD or DVD770 system of Sony, all get permission to use the producer of DVD technology to encrypt for their decryption key, so the no one can decipher with backward read technology playback software.

But, have a family to get permission to use the producer of DVD not encrypt.In November, 1999, the developer of DeCSS, one comes from Norway and utilizes the technology of backward read XingDVD player " backward read technology great master " group (MoRE), has obtained a key.The readable DVD video display of this cover program also deposit file the hard disk of computer in, but the file that deposits hard disk in no longer comprises original encipheror.Finishing whole work is not difficult matter, only needs a DVD-ROM driver and a large amount of hard drive spaces (hard disk that magnanimity is big is many on market now must be) to get final product.Certainly, CPU speed is fast more, and it is just short more to duplicate the needed time.After tested, on the Pentium III computer of 500MHz, handling the DVD file only needs general 10 minutes.

3) encrypted sector

The DVD dish of the visual out of order coded system of every employing all has an encrypted sector, is mainly used to store CSS reduction pins.As everybody knows, common DVD sector is 2048 bytes, and this encrypted sector is 2052 bytes.This makes reading with the conventional method difference of it, and in addition, this sector only just can imprinting on the compressing tablet motherboard, and DVD R or DVD RAM do not support to write encrypted sector, make it to be difficult for copy.

Though DVD has adopted means such as above-mentioned multiple encryption, still can't prevent piracy effectively.At present nearly all DVD video reproduction software all has been equipped with and has eliminated the tool software (for example DVD Region Selector) of DVD area code, and can eliminate the copying image of the DVD restriction to the vhs video band; The CSS decryption software is the most famous with " DeCSS ", and itself capacity has only 60kB.It can read the view data (vob file) through encrypting in the DVD CD, and will record on the hard disk of computer after its deciphering.

The seriousness of problem will be followed arrival in 2000 and be on the rise.Because appearance along with DVD recorder in 2000, if use above-mentioned software, just the image of legal DVD CD can be stored in advance on the hard disc of computer (at this moment, the key that prevents bootlegging is removed fully), from hard disc of computer, it is transcribed on the DVD recorder again, thereby obtain the pirate DVD CD of making no distinction of rank easily with legal DVD CD image quality.If untimely taking measures, the DVD pirated CDs will drive straight on DVD market, as go into unmanned ground.This also just DVD producer least wish to see.

In addition, the broadcast of existing video display CD (as DVD and VCD) does not have necessary order, and the user can select arbitrarily to begin to play from any position.Can't require to play other content again to after the complete segment broadcast.

Summary of the invention

The objective of the invention is to release a kind of manufacture method that the video display CD of played in order is arranged, in normal video files, insert the content of forcing broadcast, make CD when playing, after having only normally, intactly having broadcasted the pressure broadcast content, could broadcast movie and television contents.

The manufacture method of the video display CD that played in order is arranged that the present invention proposes comprises following step:

(1) be ready to force the contents fragment that broadcasts, each fragments store is a file;

(2) will need the movie and television contents that broadcasts to be divided into corresponding cameo shot according to the hop count of forcing broadcast content, each cameo shot is stored as a file, and the journal cameo shot;

(3) each cameo shot is encrypted, concrete steps are:

1. the selected position that needs the cameo shot file of encryption,

2. generate a key, this key both had been an encryption key, also was decruption key simultaneously,

3. the order of the initial data of the cameo shot of above-mentioned record is upset by the irreversible calculating of content scrambling with above-mentioned key, finishing encryption, and the cameo shot after encrypting is saved as file this section cameo shot,

4. the decruption key (length is 40) that obtains in 2. is stored in the file, and makes the corresponding encrypt file of each decruption key file,

(4) make a content of force broadcasting corresponding with cameo shot after the encryption, concrete steps are as follows:

1. from the file in above-mentioned (1) step, select a file of forcing to broadcast,

2. selected file of storing decruption key,

3. read decruption key, and the position information of decruption key be inserted into the head of the B frame of selected pressure broadcast content randomly, the pressure broadcast content behind this editor is stored as a file,

4. make that to force to broadcast file behind the above-mentioned editor corresponding with the decruption key file, thereby it is corresponding with encrypt file to make that file is broadcasted in pressure behind the editor, promptly the content of a pressure broadcast is corresponding with cameo shot after the encryption;

(5) broadcasting file according to the pressure after with all editors of the order of cameo shot makes up with corresponding all encrypt files, form a file, order is: force broadcast content 1, video display encrypted segments 1, force broadcast content 2, video display encrypted segments 2 ... force broadcast content n, video display encrypted segments n;

(6) above-mentioned file is burnt on the DVD CD, has been played in order video display CD.

The video display CD that played in order is arranged that the present invention makes has a played in order when having realized the video display dvd playback, and the user must be to playing other required content after the specific fragment normal play.Program is divided into a plurality of fragments, the user must formulate according to the producer certain broadcast these fragments in proper order.To specific fragment must be normally, intactly after the view content (can not F.F. broadcast), just can watch the content that it is follow-up.The CD that the present invention makes can effectively combat copyright piracy, protection copyright owner's legitimate rights and interests.

Embodiment

Introduce detailed content of the present invention below.

The video display CD that played in order is arranged that the present invention makes is mainly used in the DVD disc, and it adopts general DVD form, and movie and television contents is divided into a plurality of fragments, and the CSS technology by standard realizes the encryption to cameo shot.So-called CSS is meant that the initial data of DVD is encoded through CSS (Content Scrambling System), and the order of initial data is upset.The file of DVD can be copied, but because data through coding, copy the file of coming so play-over, image will be mess, and sound then has ear-piercing flip-flop.It is rather effective encryption method that CSS encrypts, so widely popular now.In simple terms, CSS is a kind of very complicated irreversible calculating.Calculating as long as formula is arranged, is exactly quite simple for computer, and its key is irreversible.Give an example, in the CSS reduction is calculated, have one to go on foot the process of getting remainder, suppose it is 7/3, remainder is 1,7th, the numeral after encrypting, and the 3rd, key, 1 is the actual value after the reduction.Even your knowledge of result 1 is also known formula, but key can not retrodict, because 7/6 also surpluss and 1,7/2 also surpluss 1.Therefore, you have no idea according to before encrypting and the numeral after encrypting obtain key.

The position information dispersion of decryption key is placed in a plurality of B frame data heads of the pressure broadcast content before the encrypted segments.For example, require fragment 2 after fragment 1 normal play, could play.When generating this DVD disc, fragment 2 is utilized the method scrambling of CSS, the information dispersion of secret key writes in the data of a plurality of B frames in the fragment 1; When using DVD player to broadcast, need special playing program, it is when normal play fragment 1, read the decruption key bit data of B frame header, after playing fragment 1, recover original decryption key, utilize the CSS decryption technology to finish deciphering again to fragment 2, thus normal possible fragment 2.

In order to have realized played in order, at first to carry out segmentation, what of the content that the pressure that what of segmentation mainly depend on to be needed to insert is broadcasted to the DVD initial data.For example, want to insert three sections in some films and force to broadcast (force to broadcast 1, force to broadcast 2, force to broadcast 3), will be divided into three sections (cameo shot 1, cameo shot 2, cameo shots 3) to original film so at least.

The content of force broadcasting is edited, purpose be the position information dispersion of the decruption key of each film segmentation of having encrypted in a plurality of B frames of pressure broadcast content.Because encryption key is 40, each is not 0 to be 1.Watch all pressure broadcast contents in order to ensure the user is complete, so 40 necessary dispersed and distributed of position information are in all B frames.Simultaneously can be not invalid because of the damage of one or two frame in order to ensure decruption key, so the information of each should be distributed in the plural B frame at least.For example, force the decruption key spoon in the broadcast 1 to be used for deciphering the film section of looking 1.40 decryption key information dispersed and distributed is in the B frame of forcing broadcast 1.Use three byte representation decryption key information, two bytes are identification byte, and the 3rd byte is descriptive information.Identification byte is 55AA, in 40 of the 3rd high 6 bit representations of byte who, and this position of the 7th bit representation is 0 or 1, last position is a check digit.For example the 3rd byte is 00010010, represents that promptly the 4th of decruption key is 1.

Pressure broadcast content among the DVD is not encrypted, but every section decoding key of forcing broadcast content to comprise the cameo shot after forcing to broadcast.Have only and intactly watched the full content of forcing broadcast, could obtain the full detail of key, promptly obtain correct decruption key.The user is complete watched the content of forcing to broadcast after, obtain complete decruption key, be used for the cameo shot of descrambling back, thereby realized the played in order that has of DVD CD.

Claims (1)

1, a kind of manufacture method that the video display CD of played in order is arranged is characterized in that, this method comprises following each step:

(1) be ready to force the contents fragment that broadcasts, each fragments store is a file;

(2) will need the movie and television contents that broadcasts to be divided into corresponding cameo shot according to the hop count of forcing broadcast content, each cameo shot is stored as a file, and the journal cameo shot;

(3) each cameo shot is encrypted, concrete steps are:

1. the selected position that needs the cameo shot file of encryption,

2. generate a key, this key both had been an encryption key, also was decruption key simultaneously,

3. the order of the initial data of the cameo shot of above-mentioned record is upset by the irreversible calculating of Content Scrambling System with above-mentioned key, finishing encryption, and the cameo shot after encrypting is saved as file this section cameo shot,

4. the decruption key that obtains in 2. is stored in the file, and makes the corresponding encrypt file of each decruption key file,

(4) make a content of force broadcasting corresponding with cameo shot after the encryption, concrete steps are as follows:

1. from the file in above-mentioned (1) step, select a file of forcing to broadcast,

2. selected file of storing decruption key,

3. read decruption key, and the position information of decruption key be inserted into the head of the B frame of selected pressure broadcast content randomly, the pressure broadcast content behind this editor is stored as a file,

4. make that to force to broadcast file behind the above-mentioned editor corresponding with the decruption key file, thereby it is corresponding with encrypt file to make that file is broadcasted in pressure behind the editor, promptly the content of a pressure broadcast is corresponding with cameo shot after the encryption;

(5) broadcasting file according to the pressure after with all editors of the order of cameo shot makes up with corresponding all encrypt files, form a file, order is: force broadcast content 1, video display encrypted segments 1, force broadcast content 2, video display encrypted segments 2 ... force broadcast content n, video display encrypted segments n;

(6) above-mentioned file is burnt on the DVD CD.