Methods and Apparatus for Secure and Adaptive Delivery of Multimedia Content
First Claim
1. A method of processing content for delivery in an information system, wherein the content is representable as access units, the method comprising the steps of:
- obtaining a set of alternate versions of an access unit for a current time slot associated with the content; and
assigning, by a processor of the information system, an encryption index to each access unit in the set of alternate versions of the access unit in the current time slot such that an encryption index increases over time.
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Abstract
Techniques for securely and adaptively delivering multimedia content are disclosed in which a set of alternate access units for each time slot is obtained. Then, the encryption stream index of each access unit from the set of alternate access units of the previous time slot are obtained. An encryption stream index is then assigned to each access unit in the set of alternate access units in the current time slot, such that the encryption index increases over time. Thus, the invention overcomes the problem of encrypting a multimedia stream that may have multiple access units for each time slot by selecting the encryption index for each access unit such that the encryption index increases, regardless of which access unit the delivery system (e.g., server) selects for transmission.
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Citations
26 Claims
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1. A method of processing content for delivery in an information system, wherein the content is representable as access units, the method comprising the steps of:
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obtaining a set of alternate versions of an access unit for a current time slot associated with the content; and assigning, by a processor of the information system, an encryption index to each access unit in the set of alternate versions of the access unit in the current time slot such that an encryption index increases over time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for processing content for delivery in an information system, wherein the content is representable as access units, the apparatus comprising:
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a memory; and at least one processor coupled to the memory and operative to;
(i) obtain a set of alternate versions of an access unit for a current time slot associated with the content; and
(ii) assign an encryption index to each access unit in the set of alternate versions of the access unit in the current time slot such that an encryption index increases over time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. Apparatus for processing content for delivery in an information system, the apparatus comprising:
a content creation system operative to;
(i) obtain a set of alternate versions of an access unit for a current time slot associated with the content; and
(ii) assign an encryption index to each access unit in the set of alternate versions of the access unit in the current time slot such that an encryption index increases over time.
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26. An article of manufacture for processing content for delivery in an information system, comprising a machine readable medium containing one or more programs which when executed implement the steps of:
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obtaining a set of alternate versions of an access unit for a current time slot associated with the content; and assigning an encryption index to each access unit in the set of alternate versions of the access unit in the current time slot such that an encryption index increases over time.
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Specification