No trademarks in upstream source

> 5. Conveying Modified Source Versions.

>You may convey a work based on the Program, or the modifications to produce it from the Program, in the form of source code under the terms of section 4, provided that you also meet all of these conditions:

> a) The work must carry prominent notices stating that you modified it, and giving a relevant date.

> 7. Additional Terms.

> c) Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or

Hmm ... so it sounds like misrepresenting the origin isn't *automatically* a GPL violation, but it's certainly acceptable for it to be one.

Cheers,
Wol