Abstract: Systems and techniques can include one or more computer-implemented methods that include: digitally signing Universal Resource Locator (URLs), which have been isolated from a source playlist document, to generate digitally signed URLs; generating a protected playlist document from the digitally signed URLs; and providing the protected playlist document for use in a video on demand system. The digitally signed URLs can be in a protected master playlist document and can point to two or more sub-playlist documents, which can themselves be protected. The digitally signed URLs can be in a protected sub-playlist document and can point to encrypted video fragments. In addition, a URL of the protected master playlist document can itself be digitally signed, and the digitally signed master playlist URL can be sent to a mobile device in response to a request for video from the mobile device.

Abstract: An aspect of the subject matter described in this specification can be embodied in one or more computer-implemented methods that include obtaining a master playlist document including references to sub-playlist documents that reference video documents of different video quality for use in a video streaming on demand system, parsing the master playlist document to extract the references, digitally signing the references, generating a protected master playlist document from the digitally signed references, and providing the protected master playlist document for use in the video streaming on demand system.

Abstract: An aspect of the subject matter described in this specification can be embodied in one or more computer-implemented methods that include obtaining a master playlist document including references to sub-playlist documents that reference video documents of different video quality for use in a video streaming on demand system, parsing the master playlist document to extract the references, digitally signing the references, generating a protected master playlist document from the digitally signed references, and providing the protected master playlist document for use in the video streaming on demand system.