>He can't since he is not the copyright owner of the GPL software. There is an ongoing case trying to establish the users right to sue over noncompliance of th

>He can't since he is not the copyright owner of the GPL software. There is an ongoing case trying to establish the users right to sue over noncompliance of the GPL, see https://sfconservancy.org/copyleft-compliance/vizio.html https://sfconservancy.org/copyleft-compliance/vizio.html, but you're right that currently only the copyright holder can sue. edit "can" is the wrong word, "have successfully sued." That said, there's thousands of copyright holders for Linux, if Rossman isn't one he can probably find one easily.