Apple is going after Mac clone maker Psystar, AppliInsider is reporting:

The Mac maker filed a formal complaint in the U.S. District Court for the Northern District of California on July 3rd, just one day after Psystar began distributing a modified version of the Mac OS X 10.5.4 Leopard update to customers who had previously purchased one of its unauthorized Mac systems.

While details of the suit are unclear at this time, AppleInsider has learned that Apple and its counsel at Townsend and Townsend and Crew LLP filed the suit on grounds of copyright infringement.

The days of the “OpenMac” may be numbered.