Oh, but they do publish that since they received a lot of flak for not releasing GPL stuff on the fourth generation devices. Unfortunately, these releases lack any means of putting them back on a device (and AFAIK some binary blob modules as well).

? How else would they manage to merged their existing Archos playback/UI/etc architecture into Android ? It's not like it's just an additional app - with all that functionality it most certainly affects the OS. Some reviewers even noted "For instance, the homescreen looks like an Archos-ed Android phone, yet delve into the media and you'll see the normal Archos UI. The battery meter changes between the Archos standard graphic and the stereotypical Android one, which is really odd and feels like you're running with two operating systems.". Not to mention special integrations like the AppsLib or their custom OTA firmware updater. IMO definitely not a stock Android build.