Christine thanks for your reply! Exactly, am looking for a way to distinguish between master and copy - specifically DVD itself - regardless about piracy (not worried about DVD content spread on networks, or content itself of original DVD copying onto another blank DVD). Even if the copy is pressed, is still a copy - just want to know if a way for me to detect "this is the copy" and "this is the original I pressed." (no matter how the copy is made). It doesn't have to be detectable by ordinary observer - just by me. (actually, that is ideal - ordinary observer actually should have no idea how to check for it, or that there is anything to check for. Even if find out how to check it, they should never be able to duplicate it on other new DVD).
So clearly if it was pressed, as you say, it cannot be ever burned in a way that would match original (probably it won't even look like it was pressed, first off - and that visual part being exact still counts - as long as the dvd can be distinguished somehow using multiple ways that are hard to replicate exactly in conjunction, thats what im trying to find out) - so it would be detected easily by me if original pressed copy is burned exactly with conventional burn hardware and crappy inkjet labels.
Question is - it can only be detected by YesCSS or NoCSS you say? No specific on the actual CSS code? Now say someone were to go to the trouble of trying to actually press a copy exactly like original, graphics and all, then send it to me and claim it is the original pressed. Would I be able to determine that it is a copy, or I could not tell because they could've put any random CSS protection there? Or to really nullify the possibility - even put the exact css code of the original so there's no difference whatsoever? Would there be a way that with Original DVD that they could replicate exactly even the appearance of the engraved label on the master and have it done exactly the same on a copy?
wii discs may be close to a scenario i might be looking for (but for dvd's not wii discs). The wii hardware was cracked and now you can even patch the wii using software I heard. However I also heard that the wii discs themselves can never ever be replicable in a way that can be recognized as exact match (by an unmodded wii). In other words the unmodded wii can actually read the encryption keys on wii disc, but not even hackers with special equipment can, they had to only attack the wii itself and exploit that, to this day no wii disc can actually be copied 100% exact to match the original wii disc (even if considering just the data exactly, not necessarily how it looks). Now that's exactly what I'm looking for, something like that, but for dvd's. Not concerned at all about piracy. Just about unique dvd disk - if this can be done, would be interested to know how (wish I can do it per dvd disk each having different image and different data, but if only option is bulk order of css protected dvd, as long as it really is an unduplicatable dvd just like a wii disc is not duplicatable, would be great)
Usually protections are exploited because of "trusted client problem". The client has to know how to decrypt the material (or no material is played)- and that in itself has to be protected, and can only go so far before it is exploited with hardware attacks. Suppose I want to get a scenario like the wii disc - i dont care that its piratable, or exploitable, or even copyable to new DVD - but for it to be uncopiable in exact form, such that the original DVD can never be copied again in 100% exact form and i could check for it. don't want to protect anything from "piracy" - in other words I want nothing be "decrypted" at all by any dvd players (preferably, nobody knows there is any secret code on the DVD at all for that matter aside from me) - but just want to be able to identify original DVD later myself if I want to, with hardware or software or algorithm that does not need to be shared with anyone and that only I know. This can be including exact appearance of DVD label, some specific stamp or encryption key or whatever embedded in DVD, etc. in which all elements cannot be copied all in conjunction to a new DVD, and to check for it is only possible under specific input (like shining a blacklight in a dark room to see some specks in specific order, the like) Surely it is possible? Just not quite sure how...