Systems, methods and apparatuses for the secure transmission and restricted use of media content

摘要

The systems, methods and apparatuses described herein permit encrypted media content to be displayed by an apparatus for a restricted time period. The apparatus may comprise a communication interface configured to couple to a controlling device to transmit a first nonce and to receive the encrypted media content and an association encryption envelope. The association encryption envelope may comprise at least a second nonce and a first time restriction expressed as a first time interval. The apparatus may further comprise a counter, a storage configured to store a value of the counter representing a time of when the first nonce is transmitted, and an engine configured to perform operations according to the first time restriction.

主权项

1. A method for distributing media content for restricted use, comprising:
receiving a request for the media content from a user device, the request comprising a content identifier identifying the media content, a user identifier identifying a user requesting the media content, a display device identifier identifying a display device coupled to the user device, a nonce and a requested time period for the media content; determining that the user is authorized to receive the media content; generating a first time duration restriction associated with the user and the media content, the first time duration restriction being generated based on the requested time period to represent a rental period of the media content to the display device; generating, on a media distribution center, an association encryption envelope to hold the nonce and the first time duration restriction, wherein the association encryption envelope includes a symmetric key to encrypt the media content and the symmetric key is associated with a combination of the user identifier and the content identifier, and wherein the association encryption envelope further includes parameters regarding a maximum permissible error drift which, when approached, prompts the display device to seek a forced association; encrypting the media content; and transmitting the encrypted media content and the association encryption envelope to the user device.