I didn't include Linux because it's just a Unix reimplementation, not theirs. or: I didn't include Firefox because it's just an NCSA Mosaic fork, not theirs.

I didn't include Linux because it's just a Unix reimplementation, not theirs. or: I didn't include Firefox because it's just an NCSA Mosaic fork, not theirs. The point being, whoever does most of the work and maintenance owns something, not who came up with some early predecessor.