According to misstilaomg.com, the suit accuses Drake, Cash Money, and Universal of Copyright Infringement. Specifically, the song sampled at the beginning of Drake's hit song, "Best I Ever Had," is allegedly property of Playboy Music, Inc. and Playboy Enterprises.
The song in question is "Fallin' In Love," by Hamilton, Joe Frank and Dennison/Reynolds. The suit claims that the defendants “knew or should have reasonably known, that the sound recording was protected by copyright…” and that “each Defendant continues to infringe upon Plaintiff’s rights in and to the copyrighted sound recording.”
The goal of the suit is to get the court to issue an injunction, which mean the defendants would be forced to stop selling/distributing the song, and to stop profiting from it. In addition, the Drake and the others would be required to account for all profits, gains and advantages made from the song, and pay costs and attorney's fees.
More on this as it develops.