10 years from the date of publication, possible extensions while derivate works like sequels are still being produced up until the death of the author. No inheritance. For corporation-owned copyright, same principle, but with an upper bound of 50 years.

After expiry, the authors should retain a right to call a derivative work original/canonical, but enjoy no other protections - so I can make my own James Bond movies, but they won't have the "canonical" stamp. This right would last a long, but finite amout of time (max 150 years) and would be inherited (to somewhat equalise individuals to corporations, since nobody lives that long).