On Friday 15 June 2007 01:46, [email protected] wrote: > if you cannot modify the software that runs on your Tivo hardware you > haven't tried very hard. Yes, but the GPLv2 clearly says that you don't have to try very hard. The preferred form of modification has to be distributed. I can run a decompiler or disassembler on a program, and I can even modify it in place with a hex editor (I have even modified programs in embedded ROMs by using focussed ion beam, so I know you can modify every program if you try hard enough). It's certainly possible to crack Tivo's firmware to accept my own signature, but it's *not* the preferred form of modification, the source code and Tivo's key for the signature. Since Tivo's firmware only accepts a signed kernel, the combination of kernel+signature is the binary they ship. The kernel itself is useless, the signature as well. Therefore, you can imply that Tivo's key is part of the "other stuff" the GPLv2 mentions, because you need it to recreate the same code as Tivo did and shipped (compilers insert timestamps and such), and to modify that code. The source code is just a mean, the thing they shipped is the end (the binary), and they have to comply with the GPL for that binary - which by all means of practical understanding includes the signature. "You can imply" means: It depends on court and legal system. I'm quite confident that in Germany, the legal system might favor the "GPLv2 does not allow tivoization" point of view, and in the USA, the legal sysem might do the opposite. -- Bernd Paysan "If you want it done right, you have to do it yourself" http://www.jwdt.com/~paysan/
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