debugmodes must be free for everyone.

d-Box 2 66MHz, 32MB SDRAM, MPEG Hardware - what else to say?
DI614 / DWL-900AP+ / ... slow ARM7TDMI CPU, ACX100 WLAN
Europa 10 ISDN Phone 8bit using an ISDN-line
Gabriel Knight 3 interesting things in a game
Car Radio Unlocking What they don't want you to know...
SIMpad Big linux display for cheap money
GameCube Cheap, PowerPC and a big hack value
Kenwood remote bus Control you PC with your KR-8090 remote control! (warning, old, crappy project!)
iPod Volume Hack Makes your european iPod as loud as the US version

Be warned: on these pages we'll see things you weren't supposed to see, and they have good reasons. Don't damage your devices! (and you can to that very easily!)

Final note:
The second piece of legal advice is also the first piece of technical advice: Reverse engineer as little as possible. The biggest legal complication of reverse engineering is when you are working from a disassembly, it can be tempting to simply translate the compiler's output into code directly in your program. This is a big legal no-no. It's almost certainly copyright infringement. And it can happen by accident.
   - James Brown, ScummVM Developer, in an interview with o'Reilly (here)


Finally my favourite quote of the german movie industry:
'Anatomie 2' hatte ca. insgesamt 800.000 Besucher, 'Anatomie', der Vorläufer und erste Teil kam auf 1,9 Mio. Besucher. Dieser drastische Rückgang ist wohl im Wesentlichen auf die zahlreichen Raubkopien im Netz zurückzuführen.
  - "Spitzenorganisation der Filmwirtschaft" and "film20" according to Telepolis


My favourite software license:
[...]
This license also allows you to
  • make as many copies of the installation media as you need for backup or installation purposes.
  • reverse-engineer the software.
  • with our written agreement, transfer the software and all rights under this license to an other party together with a copy of this license and all material, written or electronic, accompanying the software, provided that the other party reads and accepts the terms and conditions of this license. You lose the right to use the software and all other rights under this license when transferring the software.
[...]
  - IDA Pro's "License Agreement"