System and method for using DRM to control conditional access to broadband digital content
First Claim
1. A method for protecting broadcast digital content comprising:
- encrypting digital content with a first key;
encrypting the first key with a second key;
broadcasting the encrypted first key;
broadcasting the encrypted digital content in a number of segments;
protecting the second key and assigning rights to the second key; and
transmitting the protected second key and the assigned rights to a mobile terminal over at least one of a number of networks.
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Accused Products
Abstract
A system and method is disclosed for providing DRM in a broadcast environment. In accordance with the embodiment, a DRM system distributes encrypted service keys over the mobile telephone network to a mobile terminal. The mobile terminal receives the encrypted service key and uses it to decrypt encrypted content keys received from a DVB set top box. The decrypted content keys are sent to the set box over local link where they are used to decrypt encrypted broadcast content. A power management technique for mobile receivers is also disclosed that enables the receiver hardware to power off during a portion of the rendering process.
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Citations
13 Claims
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1. A method for protecting broadcast digital content comprising:
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encrypting digital content with a first key;
encrypting the first key with a second key;
broadcasting the encrypted first key;
broadcasting the encrypted digital content in a number of segments;
protecting the second key and assigning rights to the second key; and
transmitting the protected second key and the assigned rights to a mobile terminal over at least one of a number of networks. - View Dependent Claims (2, 3)
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4. A method for protecting broadcast digital content comprising:
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encrypting digital content with a first key;
encrypting the first key with a second key;
broadcasting the encrypted digital content in a number of segments, wherein each segment is broadcast in less time than is required to render the envrypted digital content contained in the segment;
protecting the second key and assigning rights to the second key; and
transmitting the protected second key and the assigned rights to a mobile terminal over a mobile network.
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5. A method for viewing protected digital content comprising:
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receiving and buffering a broadcasted segment of encrypted digital content and an encrypted first key with a broadcast receiver of a mobile terminal and turning off the broadcast receiver after the segment is received;
receiving a protected second key and assigned rights at the mobile terminal over a mobile network;
decrypting the encrypted first key with the protected second key in accordance with the assigned rights;
decrypting the broadcast segment of encrypted digital content with the decrypted first key;
rendering the digital content; and
waiting turning on the broadcast receiver after a predetermined period. - View Dependent Claims (6, 7, 8, 9)
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10. A system for protecting digital video broadcast content comprising:
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a mobile network;
a computer connected to the mobile network;
a mobile terminal connected to the mobile network;
wherein the mobile terminal comprises a content receiving device and content rendering device;
wherein the content receiving device is programmed to receive one-way content transmissions containing a plurality segments of encrypted digital content and at least one encrypted first key;
wherein the computer is programmed to protect a second key, create a rights voucher identifying allowed uses of the second key, and send the protected second key and the rights voucher to the mobile terminal over the mobile network;
wherein the mobile terminal is programmed to use the protected second key in accordance with the rights voucher to decrypt the encrypted first key, and the content receiving device is further programmed to decrypt the encrypted digital content with the decrypted first key;
wherein the mobile terminal is programmed to turn off the content reception device after receiving a first segment of encrypted digital content, and then turning the content reception device on after a predetermined period of time to receive a second segment of encrypted digital content; and
wherein the rendering device renders the decrypted digital content.
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11. A system for displaying protected digital content comprising:
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a mobile network;
a mobile terminal connected to the mobile network;
the mobile terminal comprising a content receiving device and capable of receiving broadcast content and a rendering device capable of rendering content;
wherein the content receiving device is programmed to receive broadcast content transmissions containing segments of encrypted digital content and at least one encrypted first key, and wherein the content receiving device is further programmed to send the encrypted first key to the mobile terminal over the short range network;
wherein the mobile terminal is programmed to use the protected second key in accordance with the rights voucher to decrypt the encrypted first key, and the content receiving device is further programmed to decrypt the encrypted digital content with the decrypted first key;
wherein the mobile terminal is programmed to turn off the content reception device after receiving a first segment of encrypted digital content, and then turning the content reception device on after a predetermined period of time to receive a second segment of encrypted digital content; and
wherein the rendering device renders the decrypted digital content. - View Dependent Claims (12)
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13. A system for displaying protected digital content comprising:
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a mobile terminal;
the mobile terminal comprising a content receiving device and capable of receiving broadcast content and a rendering device capable of rendering content;
wherein the content receiving device is programmed to receive broadcast content transmissions containing segments of encrypted digital content and at least one encrypted first key, and wherein the content receiving device is further programmed to communicate the encrypted first key to the mobile terminal;
wherein the mobile terminal is programmed to use the protected second key in accordance with the rights voucher to decrypt the encrypted first key, and the content receiving device is further programmed to decrypt the encrypted digital content with the decrypted first key;
wherein the mobile terminal is programmed to turn off the content reception device after receiving a first segment of encrypted digital content, and then turning the content reception device on after a predetermined period of time to receive a second segment of encrypted digital content; and
wherein at least one of the first keys is decrypted and then the encrypted digital content is decrypted and the rendering device renders the decrypted digital content.
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Specification