The Free Software Foundation has filed a copyright infringement complaint against Cisco Systems. The complaint alleges that Cisco’s Linksys products contain certain works in which the FSF holds the copyright, but Cisco has not complied with the requirements of the licenses pursuant to which the FSF makes the works available.

This is the first copyright infringement action ever filed by the FSF, according to the press release announcing the filing of the action. The filing of the lawsuit follows on the ruling by the United States Court of Appeals for the Federal Circuit last August in Jacobsen v. Katzer that open source licenses are enforceable under copyright law.