Recording and playback apparatus for stream data and transmission method for stream data
First Claim
1. A stream data recording and playback apparatus comprising:
- interface means for transmitting and receiving stream data and data for control;
a built-in or removable recording medium for recording received data;
encrypting means for performing a scramble process of data to be transmitted; and
decrypting means for performing a de-scramble process of the received data, whereby key information for the scramble process or de-scramble process is interchanged by performing, through said interface means, an authentication process between the present apparatus and another apparatus for transmission or reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with the information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, wherein when the data de-scrambled by said decrypting means and thereafter recorded on said recording medium is read, scrambled by said encrypting means and transmitted as stream data from said interface means, the copy control information added to said stream data to be transmitted is changed depending on whether said data remains to be kept on said recording medium even after said data is read out or said data is deleted from said recording medium after said data is read out.
6 Assignments
0 Petitions
Accused Products
Abstract
In transmission of stream data protected for copyright on a bus, transcription of stream data once recorded on a recording apparatus to a medium of another recording apparatus is realized. Authentication is carried out between a stream recording and playback apparatus and another recording apparatus to interchange a key for data scramble. By using this key, data is added with copy control information used when the data is recorded initially and thereafter the data is transmitted. After the data has been recorded on the recording apparatus, the data is deleted from an original recording medium. During transmission of the data, authentication from a different apparatus is rejected to prevent a plurality of copies from being made.
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Citations
19 Claims
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1. A stream data recording and playback apparatus comprising:
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interface means for transmitting and receiving stream data and data for control;
a built-in or removable recording medium for recording received data;
encrypting means for performing a scramble process of data to be transmitted; and
decrypting means for performing a de-scramble process of the received data, whereby key information for the scramble process or de-scramble process is interchanged by performing, through said interface means, an authentication process between the present apparatus and another apparatus for transmission or reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with the information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, wherein when the data de-scrambled by said decrypting means and thereafter recorded on said recording medium is read, scrambled by said encrypting means and transmitted as stream data from said interface means, the copy control information added to said stream data to be transmitted is changed depending on whether said data remains to be kept on said recording medium even after said data is read out or said data is deleted from said recording medium after said data is read out. - View Dependent Claims (2, 14, 15)
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3. A stream data recording and playback apparatus comprising:
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interface means for transmitting and receiving stream data and data for control;
a built-in or removable recording medium for recording received data;
encrypting means for performing a scramble process of data to be transmitted; and
decrypting means for performing a de-scramble process of the received data, whereby a channel is established which is adapted to transmit the stream data onto a bus signal line connected to said interface means to permit data to be interchanged between the present apparatus and another apparatus, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to cause said encrypting means to perform a scramble process of data to be transmitted on said channel or so as to cause said decrypting means to de-scramble the data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, wherein the data recorded on said recording medium is subjected to the scramble process by using said key data by means of said encrypting means and thereafter transmitted as stream data from said interface means through said channel, said data is deleted from said recording medium after read out, and authentication between the present apparatus and an apparatus other than the transmission destination apparatus is rejected during the transmission of said stream data. - View Dependent Claims (9, 10, 11, 12, 17, 18, 19)
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4. A stream data recording and playback apparatus comprising:
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interface means for transmitting and receiving stream data and data for control;
a built-in or removable recording medium for recording received data; and
encrypting means for performing a scramble process of data to be transmitted and decrypting means for performing a de-scramble process of the received data, whereby a channel is established which is adapted to transmit stream data onto a bus signal line connected to said interface means to permit data to be interchanged between the present apparatus and another apparatus, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to perform a scramble process of data to be transmitted on said channel or so as to de-scramble the data, data obtained by controlling the de-scramble process in accordance with copy control information added to stream data received by said interface means and information based on copy control information are recorded on said recording medium, stream data obtained by controlling the scramble process by information based on the copy control information read out of said recording medium and said copy control information are transmitted through said interface means, wherein when the data read out of said recording medium is to be deleted after read out, a second channel other than the channel that has already been established is established, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to perform a scramble process of data to be transmitted on said second channel or so as to de-scramble the data, the data recorded on said recording medium is subjected to the scramble process by using said key data and thereafter transmitted as stream data from said interface means through said second channel while being added with the same copy control information as that used when said data is recorded, and authentication tried by another apparatus to possess in common the key data used for said second channel is rejected during the stream data transmission on said second channel. - View Dependent Claims (5, 6, 7, 8)
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13. A stream data recording and playback apparatus having interface means for transmitting and receiving stream data and copy control information data, whereby key information for a scramble process or a de-scramble process is interchanged by performing an authentication process between the present apparatus and another apparatus for transmission or reception of stream data and the stream data is recorded on or played back from a built-in or removable recording medium,
wherein when received data is recorded on the recording medium after decrypted and de-scrambled and the recorded data is read out, encrypted and scrambled so as to be transmitted as stream data from said interface means, copy control information added to said stream data to be transmitted is changed depending whether said data remains to be kept on said recording medium even after read out or said data is deleted from said recording medium after read out.
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16. A method of transferring stream data used in a stream data recording and playback apparatus having interface means for establishing a channel for data transmission between the present apparatus and another apparatus to transmit/receive stream data and data for control, a built-in or removable recording medium for recording received data, encrypting means for performing a scramble process of data to be transmitted and decrypting means for performing de-scramble process of received data, whereby key information for the scramble process or de-scramble process is interchanged by performing an authentication process between the present apparatus and the different apparatus for transmission and reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium and stream data obtained by controlling the scramble process in accordance with information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, said stream data transfer method comprising the steps of:
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creating key data for performing a scramble process of data read out of said recording medium and establishing a channel for data transmission necessary to transmit stream data from said interface means;
performing authentication between the present apparatus and a stream data transmission destination apparatus to cause said apparatuses to possess said key data in common, scramble-processing data read out of said recording medium by using said key data by means of said encrypting means and transmitting the scrambled data as stream data from said interface means onto said data transmission channel while adding copy control information to that data; and
rejecting common possession of said key data based on a request for authentication made by an apparatus other than said transmission destination apparatus during transmission of the stream data carried out by using said transmission channel and after the transmission of the stream data ends, deleting from said recording medium the data read out of said recording medium and transmitted and braking said transmission channel and said key data.
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Specification