KDM Play-Count Parameter for Digital Film Playback Control
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Solution Overview
Problem
Existing digital film projection systems cannot meet the demands of the second-tier market for on-demand playback and charging based on play-count due to limitations in copyright protection and KDM licensing methods, which are primarily designed for commercial cinemas with fixed schedules.
Innovation Solution
A method and system that adds a play-count parameter to the KDM file, using RSA public key abstracts and TLS encryption to control digital film playback, allowing for charging based on actual play-count by embedding a play-count parameter in the KDM file and using a security module to manage and enforce playback permissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If KDM licensing method is used to control digital film playback, then copyright protection is improved, but adaptability to second-tier market demands is worsened
Solution Approach 1:
The patent segments the traditional KDM licensing system by introducing a separate play-count control module that operates independently from the time-window control. This allows the system to maintain copyright protection through KDM while adding flexible play-count based licensing suitable for second-tier markets, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The patent makes the licensing system dynamic by allowing play-count parameters to be flexibly configured and updated without requiring system redesign. The play-count control can be adjusted based on different market demands, enabling the same system to serve both traditional cinema and second-tier market requirements.
2Reliability
If fixed schedule playback control is implemented, then copyright protection is improved, but flexibility for on-demand playback is worsened
Solution Approach 1:
The patent separates time-window control and play-count control into independent functional modules. This segmentation allows operators to choose between fixed schedule playback (for copyright-protected content) and on-demand playback (for second-tier market), resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The patent creates a universal playback control system that can handle both fixed schedule and on-demand playback scenarios. The play-count control module works alongside the traditional time-window control, enabling the system to serve multiple functions and different market segments simultaneously.
3Device complexity
If traditional KDM licensing is used, then system simplicity is maintained, but functionality for play-count charging is worsened
Solution Approach 1:
The patent nests the play-count control module within the existing KDM licensing framework. The new functionality is integrated as an additional layer that works with rather than replacing the traditional system, maintaining relative simplicity while adding play-count charging capability.
Solution Approach 2:
The patent incorporates play-count parameters into the licensing process from the beginning, so that play-count charging functionality is built-in rather than added as a complex afterthought. This preliminary integration maintains system simplicity while enabling new functionality.
Data Source
AI summary
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.