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Method for making authorized transmission message for digital film system, and movie playing method and system using same

A technology of news and playback times, applied in electrical components, image communication, selective content distribution, etc., can solve problems such as loss, fraud, and underreporting of publishers and film producers, so as to improve efficiency, increase security, and prevent artificial acquisition the possible effect of

Inactive Publication Date: 2020-01-24
中影数字电影发展(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional key KDM is a time period key made according to the release time. The above-mentioned method of controlling the effective time period of playback cannot avoid that theaters can show arbitrarily during this time period, which may cause underreporting or concealment when reporting the box office. reported, which brought great losses to the issuer and the film studio.
Although there is currently a way to monitor the play log of the theater side after the fact, there is still the possibility of fraud

Method used

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  • Method for making authorized transmission message for digital film system, and movie playing method and system using same
  • Method for making authorized transmission message for digital film system, and movie playing method and system using same
  • Method for making authorized transmission message for digital film system, and movie playing method and system using same

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Embodiment Construction

[0062] The detailed description follows with reference to the accompanying drawings, which form a part hereof and, in the present invention, are shown by way of explanation of specific embodiments for carrying out the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. For example, features explained or described for one embodiment can be used on or in combination with other embodiments to yield a still further embodiment. It is intended that the present invention includes such modifications and variations. These examples were described with specific language, but they should not be construed as limiting the scope of the appended claims. The drawings are for explanatory purposes only and are not drawn to scale. For purposes of clarity, corresponding elements are denoted by the same reference numerals in the different drawings unless otherwise specifie...

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Abstract

The invention discloses a method for making an authorized transmission message for a digital film system, which is characterized by comprising the following steps: receiving a standard KDM generated based on DCI-KDM; obtaining a certificate of trusted equipment, wherein the trusted equipment is a projection server requesting to play a film; obtaining a public key of the projection server; obtaining the maximum playing times of the film which can be played by the projection server; and generating the authorized transmission message based on the standard KDM, the certificate, the public key andthe maximum playing times.

Description

technical field [0001] The invention relates to the technical field of digital movie playing in public theaters, in particular to a method for making an authorized forwarding message, a movie playing method and a system using the same. Background technique [0002] After the digital movie is compressed, encrypted, and packaged, the encrypted movie content and its key are generated. Encrypted movie content and related information form a digital movie data package (DCP, Digital Cinema Package) and send it to the cinema. The key is further encrypted with other relevant information such as key parameters (mainly the time window (valid time period) of the key, that is, the movie show schedule) and the trusted device list (TDL, TrustedDeviceList, that is, authorized List information of legal devices) are digitally signed together to form a KDM (keyDeliveryMessage, key delivery message). The key delivery message (KDM) is the file responsible for transmitting the key. The theater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/266H04N21/8543H04N21/254
CPCH04N21/2541H04N21/26613H04N21/8543
Inventor 马惟周宝林赖侁张王虎张志强宁浩晨林民杰林晓飞
Owner 中影数字电影发展(北京)有限公司
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