|
Yea, I think I know what you're talking about. It is called CPRM.
Here is some info for you guys...
CPRM is a mechanism that ties a recording to the media on which it is recorded. It is supported by some DVD recorders, but not by many DVD players. Each blank recordable DVD has a unique 64-bit media ID etched in the BCA*. When protected content is recorded onto the disc, it can be encrypted with a 56-bit C2 (Cryptomeria) cipher derived from the media ID. During playback, the ID is read from the BCA and used to generate a key to decrypt the contents of the disc. If the contents of the disc are copied to other media, the ID will be absent or wrong and the data will not be decryptable.
*BCA stands for burst cutting area, a zone near the hub of a DVD reserved for a barcode that can be etched into the disc by a high-powered (YAG) laser. Because barcode cutting is independent of the stamping process, each disc can have unique data recorded in the BCA, such as a serialized ID. DVD readers can use the laser pickup head to read the BCA.
I'm thinking that since this barcode is clearly visible on xbox discs, Xbox most likely uses this form of copy protection. As of right now, I'm not sure if they definitely use it, and I do not know of any way around it without making mods to the Xbox. If there is a way. I will find it.
Also, another problem is the fact that all x-box discs are dual-layered and you cannot make an identical bit by bit copy without having a dual-layer burner which is not even available at the moment (although they should be available before this year ends). The good news is, once they do become availble, those of you who have a dvd burner do not have to replace it. This should be a matter of nothing more then a firmware upgrade. :)
Third obstacle to over come is the differences in media. I do not know enough about this to even know whether or not it presents a problem, but I am learning more and more everyday and will post more as I figure stuff out.
Any additional information on this topic would be seriously appreciated. Especially if it is related to different media types (DVD-5, DVD-9, etc..etc..) . I will take anything I can get, links, whatever..
Anybody?
This message has been edited since posting. Last time this message was edited on 9. April 2004 @ 08:19
|
