Once Art Is In The Public Domain Can It Go Back Under Copyright?

“Congress approved the recopyrighting, limited to foreign works, to align U.S. policy with an international copyright treaty. But the Golan plaintiffs—a group that includes educators, performers, and film archivists—argue that bigger principles are at stake. Does Congress have the constitutional right to remove works from the public domain? And if it does, what’s stopping it from plucking out even more freely available works?”