Original sentence: The inability of Gracenote to enforce its patent  in the Musicmatch case opened the market for competition, and a growing global group of companies continue to enter media identification and metadata marketplace.Until the Musicmatch case, Gracenote attempted to aggressively use its patents in an attempt to enforce a monopoly in commercial CD indentification services
Edited sentence: Gracenote's loss in the Musicmatch case has opened the market for competition, and a growing group of companies continue to enter media identification and metadata marketplace