Question: Who pointed out that "if copyright were a natural right nothing could justify terminating this right after a certain period of time"?
Sentence: On the assumption that intellectual property rights are actual rights Stallman argues that this claim does not live to the historical intentions behind these laws, which in the case of copyright served as a censorship system, and later on, a regulatory model for the printing press that may have benefited authors incidentally, but never interfered with the freedom of average readers.
Answer in sentence: yes