EMI Music Publishing has filed a $100 million copyright infringement lawsuit against one of the leading providers of ringtones, just three months after the U.S. register of copyrights issued a controversial administrative ruling about the licensing of ringtones.

The EMI suit is the first significant copyright action taken by a music publisher against a ringtone provider. EMI Entertainment World Inc. v. Premium Wireless Services Inc., No. 07-CV-232 (S.D.N.Y.).