I am not sure I get your meaning. A license is how you access a copyrighted work. Therefore they are speaking about the same set of laws.

Antirez is taking a very narrow copying must include a figurative Ctrl-c Ctrl-v. Where as tomp is taking the wider and I think more legally supported(at least as far as art goes) stance that a work can be 100% your own effort but still be a derivative work if it was inspired by an existing work.(i.e. taking a photo of a sculpture is a derivative work )

It appears (IANAL) that Monit is alleging a copyright violation which would be eliminated if the License was followed, thus the two words can probably be used interchangeably.