I guess because all things related to copyright are still at an old time: just think about the ethernal questions like "can I use this photo in an article?" "is it fair use?" "DRMs or no?"... talking about copyright means getting crazy and leaving lawyer with different interpretations, unless you CLEARLY violate someone else's copyright by making a profit on it.
The same about DMCA: it is an old module and it should be updated. I also add that DMCA is something you are invited to compile only if you are sure about copyright violation: you are often also "threatened" of legal action if you compile DMCA with no correct data.
By putting all things together you can see many changes and more simplicity should be done in ALL the copyright management, and yes, also in DMCA module.