The UK also has joint authorship. The test is slightly different, though I'm not sure how much of a difference it would make in the context of FOSS. See Elena C

The UK also has joint authorship. The test is slightly different, though I'm not sure how much of a difference it would make in the context of FOSS. See Elena Cooper, Joint Authorship in Comparative Perspective: Levy v. Rutley and Divergence Between the UK and USA, http://eprints.gla.ac.uk/100708/7/100708.pdf http://eprints.gla.ac.uk/100708/7/100708.pdf To be clear, I'm not trying to say that all or even any FOSS works are or should be considered joint works. Just that the possibility could be a concern for lawyers contemplating enforcement. Certainly in other areas where you often see informal cooperation in the creation of collaborative works, such as in music, the issue absolutely does come back to bite people.