To provide a data processor which can effectively protect the profit of a provider of content data.

Secure container 104 containing content data ciphered by using content key data, the mentioned ciphered content key data, and title deed data showing the handling of the content data is inputted from a content provider management part 180, and a charging process part 187 determines at least one of the purchase style and use style of the content data according to the handling that the title deed data indicate. The charging process part 187 generates history data showing the result of the mentioned decision. Each process part is stored in a tamper-resisting circuit module.