What is the fine-grained topic of the following text: Apple has requested that Alsup rule that Psystar infringed on its copyrights and violated the Digital Millennium Copyright Act in its sale of unofficial third-party machines running Mac OS X. Apple has asserted that Psystar's circumvention of its disc protection methods for its operating system is in violation of the law. Only return the topic.
Apple's copyright infringement allegations against Psystar for its unofficial third-party machines running Mac OS X.