Broadcasting method and broadcast receiver
First Claim
1. A distributing method comprising the step of:
- distributing encrypted contents from a distributing side wherein the encrypted contents are encrypted by the distributing side and the encrypted contents are stored into a storage medium at a receiving side; and
distributing a play command with a decryption key at a time after distributing the encrypted contents to cause the encrypted contents to be played, wherein the time at which the play command and decryption key are distributed is predetermined by the distributing side and the decryption key is stored into a memory at a receiving side;
wherein, upon receiving the play command, the receiving side causes the encrypted contents to be retrieved from the storage medium and the decrypted using the decryption key is used to produce decrypted contents, and wherein the decrypted contents are outputted and the decryption key is deleted from the memory when output of the decrypted contents is finished,wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, andwherein the play command is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be retrieved from the storage medium for output.
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Abstract
A broadcasting method and a broadcast receiver whereby contents are first distributed only for storage so that the stored contents are later played back in a time period predetermined by the distributing party, the contents being encrypted for protection against unauthorized reproduction in any time period other than the intended one. A content is transmitted together with a begin store command in a first time period for storage onto a storage medium at the receiving side. In a time period subsequent to the first time period, a play command is broadcast so as to get the content retrieved from storage for playback. The content should preferably be encrypted. The encrypted content is decrypted and played back using a decryption key transmitted along with the play command in the second time period. The decryption key is deleted the moment the decryption process is terminated.
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Citations
18 Claims
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1. A distributing method comprising the step of:
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distributing encrypted contents from a distributing side wherein the encrypted contents are encrypted by the distributing side and the encrypted contents are stored into a storage medium at a receiving side; and distributing a play command with a decryption key at a time after distributing the encrypted contents to cause the encrypted contents to be played, wherein the time at which the play command and decryption key are distributed is predetermined by the distributing side and the decryption key is stored into a memory at a receiving side; wherein, upon receiving the play command, the receiving side causes the encrypted contents to be retrieved from the storage medium and the decrypted using the decryption key is used to produce decrypted contents, and wherein the decrypted contents are outputted and the decryption key is deleted from the memory when output of the decrypted contents is finished, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the play command is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be retrieved from the storage medium for output. - View Dependent Claims (2)
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3. A distributing receiver comprising:
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a receiving unit which receives encrypted contents, which are encrypted by a distributing side, and which is distributed from the distributing side, and receives a play command with a decryption key at a time after distributing the encrypted contents to cause the encrypted contents to be played, wherein the time at which the play command and the decryption key are distributed is predetermined by the distributing side; a storage medium which stores the encrypted contents; a memory which stores the decryption key; a processor which stores the encrypted contents into the storage medium, stores the decryption key into the memory, retrieves the encrypted contents from the storage medium in accordance with the play command, decrypts the encrypted contents by using the decryption key stored in the memory, outputs decrypted contents, and deletes the decryption key from the memory when output of the decrypted contents is finished, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the play command is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be retrieved from the storage medium for output. - View Dependent Claims (4, 5, 6, 7)
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8. A distributing method comprising the step of:
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distributing encrypted contents from a distributing side wherein the encrypted contents are encrypted by the distributing side and the encrypted contents are stored into a memory storage unit at a receiving side; and distributing a play command with a decryption key at a time after distributing the encrypted contents to cause the encrypted contents to be played, wherein the time at which the play command and decryption key are distributed is predetermined by the distributing side and the decryption key is stored into the memory storage unit at a receiving side; wherein, upon receiving the play command, the receiving side causes the encrypted contents to be retrieved from the memory storage unit and decrypted using the decryption key to produce decrypted contents, and wherein the decrypted contents are outputted and the decryption key is deleted from the memory storage unit when output of the decrypted contents is finished, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the play command is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be retrieved from the memory storage unit for output. - View Dependent Claims (9)
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10. A distributing receiver comprising:
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a receiving unit which receives encrypted contents, which are encrypted by a distributing side, and which is distributed from the distributing side, and receives a play command with a decryption key at a time after distributing the encrypted contents to cause the encrypted contents to be played, wherein that time at which the play command and decryption key are distributed is predetermined by the distributing side; a memory storage unit which stores the encrypted contents and the decryption key; a processor which stores the encrypted contents into the memory storage unit, stores the decryption key into the memory storage unit, retrieves the encrypted contents from the memory storage unit in accordance with the play command, decrypts the encrypted contents by using the decryption key stored in the memory storage unit, outputs decrypted contents, and deletes the decryption key from the memory storage unit when output of the decrypted contents is finished, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the play command is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be retrieved from the memory storage unit for output. - View Dependent Claims (11, 12, 13, 14)
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15. A distributing method comprising the step of:
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distributing encrypted contents from a distributing side wherein the encrypted contents are encrypted by the distributing side and the encrypted contents are stored into a storage medium at a receiving side; and distributing a decryption key at a time after distributing the encrypted contents, wherein the time at which the decryption key is distributed is predetermined by the distributing side and the decryption key is stored into a memory at a receiving side; wherein the decryption key is used to produce decrypted contents, and wherein the decrypted contents are outputted and the decryption key is deleted from the memory after the decrypted contents are outputted, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the decryption key is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be outputted from the storage medium.
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16. A distributing receiver comprising:
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a receiving unit which receives encrypted contents, which are encrypted by a distributing side, and which is distributed from the distributing side, and receives a decryption key at a time after distributing the encrypted contents, wherein the time at which the decryption key is distributed is predetermined by the distributing side; a storage medium which stores the encrypted contents; a memory which stores the decryption key; a processor which stores the encrypted contents into the storage medium, stores the decryption key into the memory, decrypts the encrypted contents by using the decryption key stored in the memory, outputs decrypted contents, and deletes the decryption key from the memory after the decrypted contents are outputted, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the decryption key is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be outputted from the storage medium.
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17. A distributing method comprising the step of:
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distributing encrypted contents from a distributing side wherein the encrypted contents are encrypted by the distributing side and the encrypted contents are stored into a memory storage unit at a receiving side; and distributing a decryption key at a time after distributing the encrypted contents, wherein the time at which the decryption key is distributed is predetermined by the distributing side and the decryption key is stored into the memory storage unit at a receiving side; wherein the decryption key is used to produce decrypted contents, and wherein the decrypted contents are outputted and the decryption key is deleted from the memory storage unit after the decrypted contents are outputted, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the decryption key is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be outputted from the memory storage unit.
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18. A distributing receiver comprising:
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a receiving unit which receives encrypted contents, which are encrypted by a distributing side, and which is distributed from the distributing side, and receives a decryption key at a time after distributing the encrypted contents, wherein that time at which the decryption key is distributed is predetermined by the distributing side; a memory storage unit which stores the encrypted contents and the decryption key; a processor which stores the encrypted contents into the memory storage unit, stores the decryption key into the memory storage unit, retrieves the encrypted contents from the memory storage unit, decrypts the encrypted contents by using the decryption key stored in the memory storage unit, outputs decrypted contents, and deletes the decryption key from the memory storage unit after the decrypted contents are outputted, wherein the encrypted contents are distributed with a first identifier identifying the encrypted contents, and wherein the decryption key is distributed with a second identifier identifying the first identifier to indicate the encrypted contents to be outputted from the memory storage unit.
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Specification