[housemusicfan]

I don't think you understand how the GPL works. Merely creating a derived work does not mean you must make source available publicly (a la AGPL).

[dzsekijo]

That's true but you must give the source to your customer and they should be free to redistribute.

[housemusicfan]

This is correct, and the customer has full rights to redistribute. But the original customer may be limited to paying Red Hat customers only and still remain in full compliance.

[fredski42]

And they are! However Red Hat is then free to terminate their business relation with you.