Patent ID: 8447992

Claim:
A method for distributing content from a computer system (PC) to a mobile device (ME), comprising the steps of: providing a memory storing a folder (DRM) which is attachable to the mobile device (ME) and accessible by a computer system (PC) for exchange of DRM files between the mobile device (ME) and the computer system (PC); in the mobile device (ME) creating a rights object request file (RORequest.rop) including information necessary for forming a rights object response file (ROResponse) including a nonce associated with the mobile device (ME); storing the rights object request file in the folder (DRM) stored in the memory; storing a copy of the nonce in the mobile device (ME); letting the computer system (PC) enter a communication mode for reading and storing files in the folder (DRM); in the computer system (PC) accessing the memory and reading the rights object request file from the folder (DRM); in the computer system (PC), based on a protected content file, forming a rights object file (Content.ro) using said information in the rights object request file and an encrypted content file (Content.dcf); storing the rights object file (Content.ro) and the encrypted content file (Content.dcf) in the folder (DRM) stored in the memory; in the mobile device (ME) accessing the folder (DRM) from the memory and retrieving the rights object file (Content.ro), and decrypting the associated encrypted content file (Content.dcf) using the rights object file (Content.ro) and the stored copy of the nonce.