"Joint holders can also enforce copyright, though open source codebases work more like collective copyright."
Joint copyright is basically non-existent in the US. For example, you must intend to create a joint work at the time of creation. You can't make it joint later on by signing a document saying it's joint with someone. There are other issues too.
This is deliberate, as joint owners each own a 100% enforceable set of rights, and the law doesn't really want tons of people running around claiming to own the same work.
"That said, non-exclusive Linux kernel copyright holders have performed enforcement activities (quietly or noisily)..."
Not in the US. It's not possible in the US. It'll get dismissed immediately.
Joint copyright is basically non-existent in the US. For example, you must intend to create a joint work at the time of creation. You can't make it joint later on by signing a document saying it's joint with someone. There are other issues too.
This is deliberate, as joint owners each own a 100% enforceable set of rights, and the law doesn't really want tons of people running around claiming to own the same work.
"That said, non-exclusive Linux kernel copyright holders have performed enforcement activities (quietly or noisily)..."
Not in the US. It's not possible in the US. It'll get dismissed immediately.