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Between a transmitting device and a receiving device, a first authentication and key exchange procedure depending on a radio link layer network is carried out, and then a whole or a part of a second authentication and key exchange procedure depending on the copyright protected contents data is carri

Between a transmitting device and a receiving device, a first authentication and key exchange procedure depending on a radio link layer network is carried out, and then a whole or a part of a second authentication and key exchange procedure depending on the copyright protected contents data is carried out by using the cipher communication using a first encryption key that is shared between the transmitting device and the receiving device by the first authentication and key exchange procedure, so that the contents data transfer by the cipher communication using a second encryption key can be carried out only between legitimate pair of the transmitting device and the receiving device that can successfully complete the first authentication.

대표청구항 ▼

What is claimed is: 1. A transmitting device for transmitting copyright protected contents data to a receiving device through radio communications the transmitting device comprising: a first authentication unit configured to carry out a first authentication with the receiving device, for judging wh

What is claimed is: 1. A transmitting device for transmitting copyright protected contents data to a receiving device through radio communications the transmitting device comprising: a first authentication unit configured to carry out a first authentication with the receiving device, for judging whether the receiving device is a device that is allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key with the receiving device when the first authentication with the receiving device by the first authentication unit is successful; a second authentication unit configured to carry out a second authentication with the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key with the receiving device when the second authentication with the receiving device by the second authentication unit is successful; and a communication unit configured to transmit the contents data to the receiving device through an encrypted communication path which is encrypted by using the second encryption key and provided on the radio link layer, wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with the receiving device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with the receiving device is unsuccessful. 2. The transmitting device of claim 1, wherein when the second authentication or sharing of the second encryption key is failure for a reason that the encrypted radio communication on the radio link layer is missing, one of the second authentication unit and the second key exchange unit notifies the failure and the reason to the receiving device. 3. The transmitting device of claim 1, further comprising a storage unit configured to store the contents data. 4. The transmitting device of claim 1, wherein the first authentication by the first authentication unit is success when a PIN code entered at the transmitting device and a PIN code notified from the receiving device are in a prescribed relationship. 5. The transmitting device of claim 4, wherein each PIN code contains at least one of a varying code information, a prescribed code information, a body information acquired from a body of a user, and an attribute information regarding attributes of the user. 6. A transmitting device for transmitting copyright protected contents data to a receiving device through radio communications, the transmitting device comprising: a first authentication unit configured to carry out a first authentication with the receiving device, for judging whether the receiving device is a device that is allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key with the receiving device when the first authentication with the receiving device by the first authentication unit is successful; a second authentication unit configured to carry out a second authentication with the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key with the receiving device when the second authentication with the receiving device by the second authentication unit is successful; and a communication unit configured to set up an encrypted communication path which is encrypted by using the second encryption key on the encrypted radio communication which is encrypted by using the first encryption key, and transmit the contents data to the receiving device through the encrypted communication path, wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with the receiving device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with the receiving device is unsuccessful. 7. The transmitting device of claim 6, wherein when the second authentication or sharing of the second encryption key is failure for a reason that the encrypted radio communication on the radio link layer is missing, one of the second authentication unit and the second key exchange unit notifies the failure and the reason to the receiving device. 8. The transmitting device of claim 6, further comprising a storage unit configured to store the contents data. 9. The transmitting device of claim 6, wherein the first authentication by the first authentication unit is success when a PIN code entered at the transmitting device and a PIN code notified from the receiving device are in a prescribed relationship. 10. The transmitting device of claim 9, wherein each PIN code contains at least one of a varying code information, a prescribed code information, a body information acquired from a body of a user, and an attribute information regarding attributes of the user. 11. A receiving device for receiving copyright protected contents data transmitted from a transmitting device through radio communications, the receiving device comprising: a first authentication unit configured to carry out a first authentication with the transmitting device, for enabling the receiving device to operate as a device that is allowed to communicate with the transmitting device, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key with the transmitting device when the first authentication with the transmitting device by the first authentication unit is successful; a second authentication unit configure to carry out a second authentication with the transmitting device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key with the transmitting device when the second authentication with the transmitting device by the second authentication unit is successful; and a communication unit configured to receive the contents data transmitted from the transmitting device through an encrypted communication path which is encrypted by using the second encryption key and provided on the radio link layer, wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with the transmitting device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with the transmitting device is unsuccessful. 12. The receiving device of claim 11, further comprising a reproduction unit configured to reproduce the contents data. 13. The receiving device of claim 11, wherein the first authentication by the first authentication unit is success when a PIN code entered at the receiving device and a PIN code notified from the transmitting device are in a prescribed relationship. 14. The receiving device of claim 13, wherein each PIN code contains at least one of a varying code information, a prescribed code information, a body information acquired from a body of a user, and an attribute information regarding attributes of the user. 15. A receiving device for receiving copyright protected contents data transmitted from a transmitting device through radio communications, the receiving device comprising: a first authentication unit configured to carry out a first authentication with the transmitting device, for enabling the receiving device to operate as a device that is allowed to communicate with the transmitting device, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key with the transmitting device when the first authentication with the transmitting device by the first authentication unit is successful; a second authentication unit configured to carry out a second authentication with the transmitting device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key with the transmitting device when the second authentication with the transmitting device by the second authentication unit is successful; and a communication unit configured to set up an encrypted communication path which is encrypted by using the second encryption key on the encrypted radio communication which is encrypted by using the first encryption key, and receive the contents data transmitted from the transmitting device through the encrypted communication path, wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with the transmitting device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with the transmitting device is unsuccessful. 16. The receiving device of claim 15, further comprising a reproduction unit configured to reproduce the contents data. 17. The receiving device of claim 15, wherein the first authentication by the first authentication unit is success when a PIN code entered at the receiving device and a PIN code notified from the transmitting device are in a prescribed relationship. 18. The receiving device of claim 17, wherein each PIN code contains at least one of a varying code information, a prescribed code information, a body information acquired from a body of a user, and an attribute information regarding attributes of the user. 19. A radio communication system, comprising a transmitting device for transmitting copyright protected contents data through radio communications, and a receiving device for receiving the contents data transmitted from the transmitting device, each one of the transmitting device and the receiving device having: a first authentication unit configured to carry out a first authentication between the transmitting device and the receiving device, for judging whether the transmitting device and the receiving device are devices that are allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key between the transmitting device and the receiving device when the first authentication between the transmitting device and the receiving device by the first authentication unit is successful; a second authentication unit configured to carry out a second authentication between the transmitting device and the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key between the transmitting device and the receiving device when the second authentication between the transmitting device and the receiving device by the second authentication unit is successful; and a communication unit configured to transfer the contents data from the transmitting device to the receiving device through an encrypted communication path which is encrypted by using the second encryption key and provided on the radio link layer; wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with one of the transmitting device and the receiving device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with one of the transmitting device and the receiving device is unsuccessful. 20. A radio communication system, comprising a transmitting device for transmitting copyright protected contents data through radio communications, and a receiving device for receiving the contents data transmitted from the transmitting device, each one of the transmitting device and the receiving device having: a first authentication unit configured to carry out a first authentication between the transmitting device and the receiving device, for judging whether the transmitting device and the receiving device are devices that are allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; a first key exchange unit configured to generate a first encryption key and share the first encryption key between the transmitting device and the receiving device when the first authentication between the transmitting device and the receiving device by the first authentication unit is successful; a second authentication unit configured to carry out a second authentication between the transmitting device and the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key between the transmitting device and the receiving device when the second authentication between the transmitting device and the receiving device by the second authentication unit is successful; and a communication unit configured to set up an encrypted communication path which is encrypted by using the second encryption key on the encrypted radio communication which is encrypted by using the first encryption key, and transfer the contents data from the transmitting device to the receiving device through the encrypted communication path, wherein at least one of the second authentication unit and the second key exchange unit rejects its process of at least one of authentication and key exchange with one of the transmitting device and the receiving device when at least one of the first authentication by the first authentication unit and the first key exchange by the first key exchange unit with one of the transmitting device and the receiving device is unsuccessful. 21. A contents data transfer method in a radio communication system comprising a transmitting device for transmitting copyright protected contents data through radio communications and a receiving device for receiving the contents data transmitted from the transmitting device, the contents data transfer method comprising: carrying out a first authentication between the transmitting device and the receiving device, for judging whether the transmitting device and the receiving device are devices that are allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; generating a first encryption key and sharing the first encryption key between the transmitting device and the receiving device when the first authentication between the transmitting device and the receiving device is successful; carrying out a second authentication between the transmitting device and the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; generating a second encryption key and sharing the second encryption key between the transmitting device and the receiving device when the second authentication between the transmitting device and the receiving device is successful; rejecting a process of at least one of authentication and key exchange with one of the transmitting device and the receiving device when at least one of the first authentication and the first key exchange with one of the transmitting device and the receiving device is unsuccessful, and transferring the contents data from the transmitting device to the receiving device through an encrypted communication path which is encrypted by using the second encryption key and provided on the radio link layer. 22. A contents data transfer method in a radio communication system comprising a transmitting device for transmitting copyright protected contents data through radio communications and a receiving device for receiving the contents data transmitted from the transmitting device, the contents data transfer method comprising: carrying out a first authentication between the transmitting device and the receiving device, for judging whether the transmitting device and the receiving device are devices that are allowed to communicate with the transmitting device or not, on a radio link layer of the radio communications; generating a first encryption key and sharing the first encryption key between the transmitting device and the receiving device when the first authentication between the transmitting device and the receiving device is successful; carrying out a second authentication between the transmitting device and the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; generating a second encryption key and sharing the second encryption key between the transmitting device and the receiving device when the second authentication between the transmitting device and the receiving device is successful; rejecting a process of at least one of authentication and key exchange with one of the transmitting device and the receiving device when at least one of the first authentication and the first key exchange unit one of the transmitting device and with the receiving device is unsuccessful; and setting up an encrypted communication path which is encrypted by using the second encryption key on the encrypted radio communication which is encrypted by using the first encryption key, and transferring the contents data from the transmitting device to the receiving device through the encrypted communication path. 23. A transmitting device for transmitting copyright protected contents data to a receiving device through radio communications, the transmitting device comprising: a first key exchange unit configured to generate a first encryption key and share the first encryption key with the receiving device; an authentication unit configured to carry out an authentication with the receiving device, for protecting copyright of the contents data to be transmitted, through an encrypted radio communication using the first encryption key; a second key exchange unit configured to generate a second encryption key and share the second encryption key with the receiving device when the authentication with the receiving device by the authentication unit is successful, wherein an encrypted communication path which is encrypted by using the second encryption key is set up on the encrypted radio communication which is encrypted by using the first encryption key, and the contents data are transmitted to the receiving device through the encrypted communication path, and wherein the second key exchange unit rejects its process of key exchange with the receiving device when at least one of the authentication by the authentication unit and the first key exchange by the first key exchange unit with the receiving device is unsuccessful. 24. A receiving device for receiving copyright protected contents data transmitted from a transmitting device through radio communications, the receiving device comprising: a first key exchange unit configured to generate a first encryption key and share the first encryption key with the transmitting device; an authentication unit configured to carry out an authentication with the transmitting device, for protecting copyright of the contents data to be received, through an encrypted radio communication using the first encryption key; and a second key exchange unit configured to generate a second encryption key and share the second encryption key with the transmission device when the authentication with the transmitting device by the authentication unit is successful, wherein an encrypted communication path which is encrypted by using the second encryption key is set up on the encrypted radio communication which is encrypted by using the first encryption key, the contents data transmitted from the transmitting device are received through the encrypted communication path, and wherein the second key exchange unit rejects its process of key exchange with the transmitting device when at least one of the authentication by the authentication unit and the first key exchange by the first key exchange unit with the transmitting device is unsuccessful.