If they outlaw training manuals….

then only outlaws will get training.
Defense Watch has a report by Ralph W. Omholt on his experience with buying the ground-school training course CD-Rom for a Boeing 737. He had a legitimate reason – he’s a “career pilot qualified to captain the Boeing 737 and an instructor pilot” – and was contacted by the seller of the CD to return it, as the FBI was asking for the CD to be returned. After doing so, Omholt was then subpeona’d for a federal grand jury investigation about the CDRom.
It would be interesting to know more, but apparently once you receive such a subpeona, you’re not allowed to talk about it – thanks to the “USA Patriot Act.”