In recent years, multimedia has been widely applied in various occasions. How to provide public transport passengers a varied and protected copyright multimedia entertainment services have become an important issue. Besides, that public transport provides passengers a varied and protected copyright multimedia entertainment service. In this thesis, a secure public transport multimedia on demand (MoD) system is proposed for VANET that not only protects the transmission of copyrighted multimedia data but also provides passengers with more multimedia services during long travel. Our scheme can be applied to actual practice and enhances the competitiveness of public transport companies.