Because the copyright protection period is 50 years after the author's death, historical masterpieces have exceeded the protection period and entered the public domain. Everyone can use them, but they can't be printed and published.

In Article 21 of the Copyright Law, the protection period of citizens' right of publication and the rights stipulated in Item (5) to Item (17) of Paragraph 1 of Article 10 of this Law is the author's life and 50 years after his death, ending at 65438+February 3 1 day in the fiftieth year after his death; If it is a cooperative work, the deadline is 65438+February 3 1 50 years after the death of the last dead author.