Fun fact, the Foo fighters own all of their music. They're one of the few if only bands that actually do. The main reason is the fact that after Nirvana Dave grohl had fuck you money. This is one of the reasons why that band is so special. For them it is all about the music. It didn't start out as a struggle. All of their catalog is a passion project, and that's pretty cool.

That said, I doubt a lawsuit would really go anywhere.