Some published works that are in the public domain, such as all works created by the U.S. Federal government, are still treated like other works under copyright, and therefore locked after 1922.
一些出版作業是在公有領域進行的，例如美國聯邦政府創造的所有作品，但那些作品仍被視如其他版權保護的作品般對待，導致它們在1922年之後遭禁。