System and method for secure distribution of digital content via a network
First Claim
1. A system for the secure distribution of digital content, comprising:
- encrypted control information including a data key and a time code defining a window-of-opportunity;
an encrypted digital content stream; and
a tamper-resistant environment providing means for decrypting the encrypted control information, for using a secure local clock to verify the window-of-opportunity with the time code, and for using the decrypted data key to decrypt the encrypted digital content stream and convert the decrypted stream to an analog output stream, whereby the encrypted digital content stream is convertible to an analog output stream only during the window-of-opportunity by a system having means for decrypting the encrypted control information and for verifying the window-of-opportunity.
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Accused Products
Abstract
The invention defines a system and method for broadcasting high quality, digitally encoded music and/or video (hereinafter called “content”) such that the content, once received, cannot be further redistributed in digital form. The content may be played as received on a receiving means (hereinafter called a “receiver”) or may be recorded digitally for later play-back on the same receiver. In one embodiment incorporating transportable ‘smart tokens’, the content may later be played back on a different receiver. The invention is directed primarily to preventing the piracy of content broadcast in support of services such as digital radio or television. In one preferred embodiment the invention may also be used to prevent piracy in the retail distribution of digital content.
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Citations
42 Claims
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1. A system for the secure distribution of digital content, comprising:
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encrypted control information including a data key and a time code defining a window-of-opportunity;
an encrypted digital content stream; and
a tamper-resistant environment providing means for decrypting the encrypted control information, for using a secure local clock to verify the window-of-opportunity with the time code, and for using the decrypted data key to decrypt the encrypted digital content stream and convert the decrypted stream to an analog output stream, whereby the encrypted digital content stream is convertible to an analog output stream only during the window-of-opportunity by a system having means for decrypting the encrypted control information and for verifying the window-of-opportunity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 42)
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25. A method for securely distributing a digital content stream via a communications network, the method comprising the steps of:
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(a) providing encrypted control information including a data key and a time code defining a window-of-opportunity;
(b) providing an encrypted digital content stream via a communications network;
(c) the data key being valid for decrypting the encrypted digital content stream during the window-of-opportunity;
(d) providing a tamper-resistant environment for carrying out the following steps, the tamper-resistant environment including a private key and a local clock providing a local real time, (1) receiving the encrypted control information, (2) using the private key to decrypt the received encrypted control information, (3) comparing the local real time with the time code to determine whether the local real time is within the window-of-opportunity, (4) receiving the encrypted digital content stream, (5) enabling decryption of the received encrypted digital content stream by the data key when the local real time is within the window-of-opportunity, (6) converting the decrypted digital content stream to analog signals, and (7) providing the analog signals outside the tamper-resistant environment; and
(e) outputting the analog signals representing the digital content stream. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A computer program product storing a method executable by a digital platform for carrying out the following steps:
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(a) providing encrypted control information including a data key and a time code defining a window-of-opportunity;
(b) providing an encrypted digital content stream via a communications network;
(c) the data key being valid for decrypting the encrypted digital content stream during the window-of-opportunity;
(d) providing a tamper-resistant environment for carrying out the following steps, the tamper-resistant environment including a private key and a local clock providing a local real time, (1) receiving the encrypted control information, (2) using the private key to decrypt the received encrypted control information, (3) comparing the local real time with the time code to determine whether the local real time is within the window-of-opportunity, (4) receiving the encrypted digital content stream, (5) enabling decryption of the received encrypted digital content stream by the data key when the local real time is within the window-of-opportunity, (6) converting the decrypted digital content stream to analog signals, and (7) providing the analog signals outside the tamper-resistant environment; and
(e) outputting the analog signals representing the digital content stream. - View Dependent Claims (41)
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Specification