This is a case from the US Court of Appeals for the Federal Circuit (which holds exclusive jurisdiction over patent appellate matters) that considers the intersection of copyright and licensing law. Is it possible for a copyright holder to dedicate certain work to free public use and yet enforce an A open source @ copyright license to control the future distribution and modification of that work?
Here, the plaintiff holds a copyright that he dedicated to the public domain through open-source licensing. The license for open-source technology, though, has a catch (the source of all open-source code must be acknowledged in downstream works), and the downstream users have to comply with the catch or be caught infringing the open-source license.