Forking, calling it something else and selling it is okay by the GPL. Using a different license isn't. A piece of code that's under the GPL must remain under th

Forking, calling it something else and selling it is okay by the GPL. Using a different license isn't. A piece of code that's under the GPL must remain under the GPL unless the author (copyright holder that is) decides to change the license. At least that's how I understood it. So while you can fork it and sell it, you can't sell it under a different license, which is what those guys did.