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Various enhancements are made to using smart cards that are associated with (or to be associated with) a household. In one embodiment, data that is expected to be of value to a user (e.g., electronic money) is attached to that user's smart card(s), thereby providing an incentive for the user to keep

Various enhancements are made to using smart cards that are associated with (or to be associated with) a household. In one embodiment, data that is expected to be of value to a user (e.g., electronic money) is attached to that user's smart card(s), thereby providing an incentive for the user to keep his or her smart card(s) secure. In another embodiment, the smart cards are used for parental control (e.g., by restricting the children's access to one or more of the smart cards). In yet another embodiment, smart cards are used to enhance user privacy by maintaining user-specific information on the smart cards (which can be de-coupled from the computing device whenever the user desires). In another embodiment, the boundaries of a network of computing devices are defined by multiple smart cards--any computing device to which a smart card is coupled is part of the network.

대표청구항 ▼

The invention claimed is: 1. A smart card comprising: a key, associated with a household, to be used to encrypt and decrypt media content at the household that is associated with the household, the key being a combination of a household identifier and a private key of a private key/public key pair;

The invention claimed is: 1. A smart card comprising: a key, associated with a household, to be used to encrypt and decrypt media content at the household that is associated with the household, the key being a combination of a household identifier and a private key of a private key/public key pair; and a memory unit, the memory unit including, a user-specific information storage section to store user preferences, and a data storage section to store data that is expected to be of value to a user. 2. A smart card as recited in claim 1, wherein the memory unit comprises a nonvolatile memory. 3. A smart card as recited in claim 1, wherein the data comprises electronic money. 4. A smart card as recited in claim 3, wherein the smart card can be used to encrypt and decrypt media content only if at least a threshold amount of electronic money is stored on the smart card. 5. A smart card as recited in claim 1, wherein the smart card corresponds to a particular category of media content and is used to encrypt and decrypt only that particular category of media content. 6. A smart card as recited in claim 5, wherein one of the categories of media content comprises family-oriented media content and another of the categories of media content comprises adult-oriented media content. 7. A smart card as recited in claim 1, wherein the memory unit further includes a rating associated with the smart card that is used to compare the rating with a rating corresponding to the media content and determine, based on the comparison, whether to allow access to the media content. 8. A smart card as recited in claim 1, wherein the smart card is used to limit where rendering of the media content can occur. 9. A smart card as recited in claim 1, wherein the user preferences comprise one or more channels preferred by the user. 10. A smart card as recited in claim 1, wherein the user preferences comprise one or more viewing times preferred by the user. 11. A smart card as recited in claim 1, wherein the user preferences comprise one or more types of content preferred by the user. 12. A smart card comprising: a private key of a private key/public key pair; a household identifier, associated with one particular household, to be combined with the private key, and the combined value to be used to encrypt and decrypt media content that is associated with the one particular household and that is to be rendered at the one particular household, but not to encrypt and decrypt media content associated with other households; and a data storage section to store data that is expected to be of value to a user. 13. A smart card as recited in claim 12, further comprising a communications module to communicate, to a computing device module that encrypts media content, an indication of whether to encrypt the media content based on data stored in the data storage section. 14. A smart card as recited in claim 12, further comprising a communications module to communicate, to a computing device module that decrypts media content, an indication of whether to decrypt the media content based on data stored in the data storage section. 15. A smart card as recited in claim 12, further comprising a processor to execute instructions to encrypt and decrypt the media content. 16. A smart card as recited in claim 12, wherein the data storage section is maintained in a nonvolatile memory. 17. A smart card as recited in claim 12, further comprising a user-specific information storage section to store user preferences. 18. A smart card as recited in claim 12, wherein the data in the data storage section comprises electronic money. 19. A method of encrypting all media content received at a user's home from a programming source, the method comprising: checking, at the user's home, whether a smart card is authorized to encrypt the media content; and encrypting, at the user's home using a key that is a combination of a household identifier associated with the user's home and a private key of a private key/public key pair, the media content regardless of whether the received media content was received scrambled, but only if the smart card is authorized to encrypt the media content. 20. A method as recited in claim 19, further comprising determining that the smart card is authorized to encrypt the media content if at least a threshold amount of electronic money is available on the smart card. 21. A method as recited in claim 19, further comprising determining that the smart card is authorized to encrypt the media content only if data is stored on the smart card that is expected to be of value to a user. 22. A method as recited in claim 19, further comprising: checking whether the smart card is authorized to decrypt media content; and decrypting the media content only if the smart card is authorized to decrypt the media content. 23. One or more computer-readable memories containing a computer program that is executable by a processor to perform the method recited in claim 19. 24. A method of decrypting media content, the method comprising: checking whether a portable integrated circuit device is authorized to decrypt the media content, wherein the portable integrated circuit device stores a decryption key and additional data, and wherein the decryption key is a combination of a household identifier and a private key of a private key/public key pair; determining that the portable integrated circuit device is authorized to decrypt the media content only if data other than electronic money is stored as the additional data on the portable integrated circuit device, wherein the data is expected to be of value to a user, and wherein the data is not used to decrypt the media content; and decrypting the media content only if the portable integrated circuit device is authorized to decrypt the media content. 25. A method as recited in claim 24, further comprising determining that the portable integrated circuit device is authorized to decrypt the media content if at least a threshold amount of electronic money is available on the portable integrated circuit device. 26. A method as recited in claim 24, further comprising: checking whether the portable integrated circuit device is authorized to encrypt media content; and encrypting the media content only if the portable integrated circuit device is authorized to encrypt the media content. 27. One or more computer-readable memories containing a computer program that is executable by a processor to perform the method recited in claim 24. 28. A system comprising: a plurality of smart cards, each to be used for encrypting different categories of multimedia presentations; and an encryption module coupled to receive a multimedia presentation and encrypt, at the user's home, the multimedia presentation based on a combination of a household identifier and a private key of a private key/public key pair maintained on one of the plurality of smart cards. 29. A system as recited in claim 28, further comprising a decoding module, coupled to receive the encrypted multimedia presentation, decrypt the encrypted multimedia presentation, decode the decrypted multimedia presentation, and transmit the decoded multimedia presentation to a rendering module. 30. A system as recited in claim 28, wherein one of the categories of multimedia presentations comprises family-oriented media content and another of the categories of multimedia presentations comprises adult-oriented media content. 31. A method of allowing parental control over media content, the method comprising: receiving, at a household, media content; encrypting, at the household, all of the received media content using a key corresponding to a smart card regardless of whether the received media content was received scrambled, wherein the key comprises a combination of a household identifier associated with one household and a private key of a private key/public key pair; and requiring the smart card to be present to decrypt and render the media content. 32. A method as recited in claim 31, wherein the requiring comprises requiring the smart card to be inserted into a smart card reader coupled to a computing device that is decrypting the media content. 33. A method as recited in claim 31, further comprising using a plurality of different smart cards to encrypt and decrypt media content, each of the plurality of smart cards corresponding to a different category of media content. 34. A method as recited in claim 33, wherein one of the categories of media content comprises family-oriented media content and another of the categories of media content comprises adult-oriented media content. 35. One or more computer-readable memories containing a computer program that is executable by a processor to perform the method recited in claim 31. 36. A method of allowing parental control over media content, the method comprising: comparing a rating corresponding to the media content to a rating associated with a smart card; and allowing access to the media content if the rating corresponding to the media content does not exceed the rating associated with the smart card, wherein a plurality of ratings do not exceed the rating associated with the smart card, and wherein the allowing access comprises allowing the media content to be encrypted using a combination of a household identifier and a private key of a private key/public key pair, at a user's home, for subsequent processing. 37. A method as recited in claim 36, wherein the comparing comprises comparing the rating corresponding to the media content to the rating associated with the smart card as stored on the smart card. 38. A method as recited in claim 36, wherein the allowing access comprises allowing the media content to be decrypted for rendering. 39. One or more computer-readable media having stored thereon a computer program that, when executed by a computing device, causes the computing device to perform acts including: receiving, at a household, media content; controlling, at the household, encryption of the received media content based on a combination of a household identifier and a private key of a private key/public key pair corresponding to a smart card; and maintaining user preferences information on the smart card, the user preferences information being available only when the smart card is coupled to the computing device. 40. One or more computer-readable media as recited in claim 39, wherein the smart card is coupled to the computing device when the smart card is inserted into a smart card reader that is coupled to the computing device. 41. A smart card comprising: a key, associated with one particular household, to be used to encrypt and decrypt media content associated with the one particular household at the one particular household but not to encrypt and decrypt media content associated with other households, wherein the key is to encrypt all the media content associated with the one particular household without regard for whether the media content was received scrambled, and wherein the key comprises a combination of a household identifier of the one particular household and a private key of a private key/public key pair; and a user-specific information storage section to store user preferences. 42. A smart card as recited in claim 41, further comprising a communications module to communicate, to a computing device module that encrypts media content, the user preferences stored in the user-specific information storage section. 43. A smart card as recited in claim 41, further comprising a processor to manage the user-specific information storage section. 44. A smart card as recited in claim 41, wherein the user-specific information storage section is maintained in a nonvolatile memory. 45. A smart card as recited in claim 41, further comprising a data storage section to store data that is expected to be of value to a user. 46. A method comprising: maintaining, on an integrated circuit card, information regarding a user's preferences corresponding to media content; and maintaining, on the integrated circuit card, a key to be used to encrypt and decrypt media content associated with one particular household at the one particular household but not to encrypt and decrypt media content associated with other households, wherein the key is to be used to encrypt all the media content associated with the one particular household without regard for whether the media content was received scrambled, and wherein the key is a combination of a household identifier of the one particular household and a private key of a private key/public key pair. 47. One or more computer-readable memories containing a computer program that is executable by a processor to perform the method recited in claim 46. 48. A method of identifying boundaries of a network of devices, the method comprising: encrypting, at a single house using a key that is a combination of a household identifier and a private key of a private key/public key pair, media content based on an identifier corresponding to a plurality of smart cards regardless of whether the media content is received scrambled; and limiting rendering of the media content to a network of devices to which the plurality of smart cards are coupled, wherein the network of devices is maintained within the single house. 49. A method as recited in claim 48, wherein the network devices include devices to receive media content and devices to render media content. 50. A method as recited in claim 48, wherein one of the plurality of smart cards is coupled to a device when the smart card is inserted into a smart card reader coupled to the device. 51. A method as recited in claim 48, wherein the plurality of smart cards can be moved to different devices to alter the boundaries of the network.