Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying a message based on application of a hashing algorithm. In one aspect, a method includes identifying a file and a key value and processing the file using multiple nonlinear functions to generate an output hash value, where the operations performed by the nonlinear functions are modified based on the key value. The file can then be verified based on the output hash value.

Abstract: In one aspect, a method includes: obtaining compressed video content within a video content processing module, a portion of a document structure of the compressed video content conforming to a predefined codec, the portion of the document structure including a plurality of video frames; decrypting the compressed video content in accordance with a digital rights management data encryption applied to the compressed video content; adding information in an extension frame associated with a portion of the document structure; and applying an encoding technique to content of one or more of the plurality of video frames after the decrypting, wherein the extension frame flags the applied encoding technique; and providing the compressed video content, including the encoded content, to a media player including a codec conforming to the predefined codec.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying a message based on application of a hashing algorithm. In one aspect, a method includes obtaining a license, from a remote server, for a content item to be presented using a player file executed by a multimedia player on a computing device. The license includes an encryption key and an authorization to present the content item using one or more authorized player files. A particular player file is received for use in presenting the content item, and a determination is made whether the particular player file is authorized for use in presenting the content item based on the authorization. The content item is decrypted using the encryption key, and the content item is presented using the particular player file in accordance with the determination.

Abstract: In one aspect, a method includes: obtaining compressed video content within a video content processing module, a portion of a document structure of the compressed video content conforming to a predefined codec, the portion of the document structure including a plurality of video frames; decrypting the compressed video content in accordance with a digital rights management data encryption applied to the compressed video content; adding information in an extension frame associated with a portion of the document structure; and applying an encoding technique to content of one or more of the plurality of video frames after the decrypting, wherein the extension frame flags the applied encoding technique; and providing the compressed video content, including the encoded content, to a media player including a codec conforming to the predefined codec.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for porting digital rights management services. In one aspect, a system includes: a hardware processor; one or more memory devices coupled with the hardware processor and effecting an operating system for the hardware processor; and a digital rights management (DRM) component having a DRM adaptor configured to check whether the hardware processor has a hardware-based encryption element, use the hardware-based encryption element if available, and use a software-based encryption element if the hardware-based encryption element is not available, wherein the software-based encryption element includes code compiled from source code for the hardware processor, the source code prepared for different computer platforms.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying a message based on application of a hashing algorithm. In one aspect, a method includes identifying a file and a key value and processing the file using multiple nonlinear functions to generate an output hash value, where the operations performed by the nonlinear functions are modified based on the key value. The file can then be verified based on the output hash value.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for porting digital rights management services. In one aspect, a system includes: a hardware processor; one or more memory devices coupled with the hardware processor and effecting an operating system for the hardware processor; and a digital rights management (DRM) component having a DRM adaptor configured to check whether the hardware processor has a hardware-based encryption element, use the hardware-based encryption element if available, and use a software-based encryption element if the hardware-based encryption element is not available, wherein the software-based encryption element includes code compiled from source code for the hardware processor, the source code prepared for different computer platforms.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying a message based on application of a hashing algorithm. In one aspect, a method includes obtaining a license, from a remote server, for a content item to be presented using a player file executed by a multimedia player on a computing device. The license includes an encryption key and an authorization to present the content item using one or more authorized player files. A particular player file is received for use in presenting the content item, and a determination is made whether the particular player file is authorized for use in presenting the content item based on the authorization. The content item is decrypted using the encryption key, and the content item is presented using the particular player file in accordance with the determination.

Abstract: In one aspect, a method includes: obtaining compressed video content within a video content processing module, a portion of a document structure of the compressed video content conforming to a predefined codec, the portion of the document structure including a plurality of video frames; decrypting the compressed video content in accordance with a digital rights management data encryption applied to the compressed video content; adding information in an extension frame associated with a portion of the document structure; and applying an encoding technique to content of one or more of the plurality of video frames after the decrypting, wherein the extension frame flags the applied encoding technique; and providing the compressed video content, including the encoded content, to a media player including a codec conforming to the predefined codec.