A Mumbai court has asked the city police to register an offence against actor Kangana Ranaut after the author of ''Didda: The Warrior Queen of Kashmir'' accused her of copyright violation, an official said on Friday.

Ashish Kaul, the author of Didda: The Warrior Queen of Kashmir, which has been translated into Hindi as ''Kashmir Ki Yodhha Rani Didda'' has accused Kangana Ranaut of copyright infringement.