Hi Tio,
FV Player uses the Flowplayer engine (we also contribute to the code base), licensed under GPLv3. We have also paid four figures for a commercial license which allows us to remove the branding but sadly only for paid users.
According to Flowplayer and the WordPress plugin moderators, specifically Otto, Flowplayer’s modification of the GPL license is okay and they are allowed to insist on front-end credit. FV Player was removed from the WordPress plugin repository for removing that front-end branding in 2011. FV Player was only reinstated when we put back the Flowplayer branding in the front end.
I strongly disagree with this exception to the GPL. The original developers from Flowplayer also contributed heavily to jQuery so it’s probably a behind-the-scenes deal between buddies to prevent us from offering a free video player at the time.
Any use of Flowplayer code without their front-end branding, they consider a violation of their purportedly GPL license. Personally I think it’s ludicrous. Welcome to how FOSS works done behind-the-scenes at WordPress.
Cheers, Alec