The U.S. Copyright Office has called for changes in the Copyright Act to encourage the use and distribution of so-called orphan works — copyrighted works whose owners may be impossible to identify or locate.

In a 200-page report released Feb. 1 and submitted to Congress, the agency outlined its legislative proposal to remedy a growing concern — the uncertainty surrounding the use of unclaimed copyrighted works and how best to ensure that others can use them for new creative efforts without fear of being sued for infringement.