METHOD FOR CONTROLLING DIGITAL FILM PLAY-COUNT AND A SYSTEM THEREOF

摘要

The invention discloses a method for controlling digital film play-count and a system thereof, wherein a play-count parameter is added into a KDM file where a key delivery message used for controlling film play is embedded, detecting the play-count parameter for a playing film, setting RSA key abstracts of an FDM packager of all authorized contracting film producers, safely importing the KDM and play-count into a security module, detecting the play-count parameter for a playing film. The film is not permitted to play unless existing play-count is less than the authorized play-count in the FDM. The invention fulfills the requirements and demands for controlling the distribution and playback of digital films in the second-tier market using technologies such as the authorized play-count and a method to charge on the basis of play-count.

主权项

1. A method for controlling digital film play-count, the method comprising the steps of:
A, in a process of generating a license file for playing a film, adding a play-count parameter into a Key Delivery Message (KDM) file where a key delivery message used for controlling film play is embedded, for generating a film delivery message file also known as a Film Delivery Message (FDM) file; B, setting a fingerprint of an RSA public key in a FDM packager of all authorized contracting film producers in a player, adding a key abstract of the FDM packager of an authorized contracting film producer into the FDM file and importing it into a security module of the player; C, detecting the play-count parameter of a playing film, detecting and judging a valid play-count on the basis of different film footages or frame length percentage so as to confirm a valid play of the current film, and using a Transport Layer Security Protocol (TLS) encryption message for informing the security module of the valid play of the film; and D, judging whether the current play-count is less than the play-count parameter in the KDM file, the film is permitted to play if yes, and prohibited if not.