It is a thing in property sale, to occasionally contain contractual obligations that force the buyer to act in a certain way (you may not cut down these trees)

It is a thing in property sale, to occasionally contain contractual obligations that force the buyer to act in a certain way (you may not cut down these trees) and additionally force the buyer to keep that obligation attached to later sales. On the surface, I cannot think of a good reason why that should not also be able to be applied to the sale of software.