GPL upheld in France

> Because you wouldn't have received the GPL licensing terms with the software in such a case.

But they didn't anyway - it had been removed, as you'd expect from a deliberate license-violator.

However, there's nothing to stop you contacting the copyright-holder to alert him to your suspicions and to ask whether your vendor is dual-licensed and entitled to supply (a derived work? ) other than under the GPL. And once you establish that it's not dual-licensed, proceed to sue the vendor yourself, if the copyright-holder isn't bothered enough to do so himself.