I didn't want to make this a witch hunt, which is why i was hesitant to start naming names. I just wanted a clarification on the position regarding proprietary content. Please don't turn it into a witch hunt...

How about the testing squad go through the emulator threads/packages sequentially and check them? It should be pretty obvious which include proprietary material. I'm talking about all emulators, not just game console emulators.

FWIW MAME claims to contain no proprietary content, it's all reverse engineered.