Orchestra conductors, movie distributors and others who rely on works of art and music in the public domain will get another chance to challenge an act of Congress that extended some copyright protections.

A three-judge panel of the 10th U.S. Circuit of Appeals on Sept. 4 upheld a lower court’s dismissal of a challenge to an act that extended copyright protections by 20 years, meaning music would be copyrighted for 70 years after an artist’s death. But the court also revived a challenge of another act extending that protection to foreign works, some of which were in the public domain.