Originally Posted by T7T
It's very simple: If it were possible to do the decryption without the dedicated hardware in the drive and purely in software, then Sony would have done so on PS3 from the 3rd generation onwards, rather than remove SACD functionality -- if not from the 1st generation. Fact is that the extra circuitry is needed to obtain the key from the disc.
Hmm, I don't think so. I think Sony has it such that all legal licenced sacd players can only have it in the hardware chip, making it much harder (or impossible) to extract a ready-made official decryption library from such a legal source. (so it has to be defeated by pure old cracking and reverse-engineering - we make our own decryption library from scratch, that does the same job.)
If it were in software on the PS3, Sony knows that it could be easily extracted, and the copy protection system would possibly be defeated pretty easily due to it being in the software realm.
This is how DVD-A's CPPM(/CPRM) system was completely defeated in 2007. A nice convenient decryption library, all laid out for the taking, called libdvdcpxm, was found in the firmware of a regular old DVD-A player. Before that was discovered, we were all using the decryption provided for us by WinDVD, which although it's in software, I think it was too legally-troublesome (and/or just too annoying) to reverse-engineer its protected CPPM decrpyter DLL in order to rip DVD-As without the need for it.
So no, I think it's just that Sony were uber careful when designing the SACD copy protection system, and stipulated that the scheme would be as hardware-based as possible, so as to make it harder to break.
Fact is that the extra circuitry is needed to obtain the key from the disc.
Maybe, maybe...there's still a lot we don't even know...there's many claims (and bogus claims based on ignorance, and we're all a little ignorant at this point) about how the system works, and if that claim is from a reliable source, it could still mean that 'you need the special circuitry (in the form of a licenced legal SACD chip) in order to decrypt SACD because there aint any software solutions available - cause sony won't "allow" it'.
I definitely think _PSP_ "needs" the circuitry in order to recognise and read the content from the SACD disc...(but anything can be emulated in software anyway, right? aaaanyway.), but with simple disc hot swapping in a dvd drive and possibly simple modification of dvd drive firmware, we don't need this extra circuitry for even PSP...
So it's possible....it just requires some hard work and time and motivation. (to crack the 80-bit encryption)