Microsoft Technology Licensing, LLC

Douglas Steedman

Majd Bakar

Kedarnath Atmaram Dubhashi

Pradip Kumar Fatehpuria

Toby Steele

Hemant Malhotra

Senthil Kumar Gnanasambandam

Mario Vera Culebro

A secure transcoder assembly features a secure data path where the related crypting and coding functions are secured in the secure data path. More specifically, during transcoding the ingress (received) encrypted video data is decrypted and copied from application memory (that is accessible to the application processor) to secure memory (that is inaccessible to the application processor) by security processor(s). Once in the secured memory, this video data is transcoded. The video data, now in its transcoded form, is re-encrypted by the security processor(s) during the transfer back to application memory for egress (continued transmission). The mode for the re-encrypting may be managed by the application processor via a crypto API, and the application processor may further feature an opaque handle on the data when it is passed to the secure region.

Secure transcoding of video data

This document describes techniques and apparatuses enabling application of digital rights management (DRM) to media streams. In one embodiment, three license levels are used to protect numerous television channels without undue use of computing resources.

Digital rights management for media streams

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Douglas Steedman