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The 4C Entity, LLC is pleased to announce that CPRM Specification, SD Memory Card Book, SD-SD Video Part, Revision 0.91 is now available. The new revision includes the treatment of the Digital Stream Usage newly defined in SD-SD Video version 1.1. More...

The 4C Entity, LLC is pleased to announce that CPRM Specification, SD Memory Card Book, SD-SD Part, Revision 0.91 is now available. The new revision incorporates usage rules based on date and time, both of which were previously supported in the 4C Specification material for CPRM for SD-Audio revision 0.97. The rules require three types of clock function modalities to define previewing and recording rules for devices.

Click here for more information about revisions to 4C specifications and license agreement and prior announcements

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Download the Specifications

CPRM/CPPM Specification
The CPRM/CPPM Specification defines a renewable cryptographic method for protecting entertainment content when recorded on physical media.

4C/Verance Watermark
CPPM adopters are required to build the Verance watermark detector into their products. The CPPM license allows content participants to embed the Verance watermark if they choose. The SDMI Phase I or DVD Audio Watermark Technology License Procedure is available online in the Licensing Area of the Web site.

4C 12 BIT Watermark Specification
This specification covers the format configuration, timing, and other details--including the basic detector function--of the 4C 12 Bit Watermark. It conveys Copy Control Information (CCI) ad other important data.

Click here for more information about revisions to 4C specifications and prior announcements

Related Documents
Please see “Developer Resources” for more information. This section links to a wide range of related materials available online and includes 4C Entity documents available for download. You may also wish to view a list of available publications and their current versions.