It's also relatively easy to write this legislation. If you: - sold licenses that are no longer usable to access the work (i.e. if you invalidate by any means

It's also relatively easy to write this legislation. If you: - sold licenses that are no longer usable to access the work (i.e. if you invalidate by any means already sold licenses) - don't put work in the public domain/don't make it freely usable without a license when the copyright expires then you lose the protection of copyright & associated (DRM/reverse engineering) laws for said works. Multiple violations can extend that to "all your works".