Content transmission apparatus, content reception apparatus and content transmission method
First Claim
1. A content transmission apparatus comprising:
- an authenticator adapted
1) to perform an authentication for a content reception apparatus, and
2) to share an authentication key with said content reception apparatus when said authentication becomes successful, and
3) to send a request for transmission range acknowledgement and authentication information to said content reception apparatus, and
4) to receive a response transmitted from said content reception apparatus responding to said request for transmission range acknowledgement, and
5) to share an exchange key with said content reception apparatus;
an encryptor adapted to encrypt a content to be transmitted to said content reception apparatus based on said exchange key; and
a timer used for measuring a time interval between transmission of a said request for transmission range acknowledgement to said content reception apparatus and reception of said response transmitted from said content reception apparatus responding to the transmission of said request for transmission range acknowledgement;
wherein, said authenticator instructs said timer to measure said time interval between said transmission of said request and said reception of said response, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content reception apparatus so that a range of the distribution of said content is limited within a house; and
wherein, said response of said request for transmission range acknowledgement from said content reception apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key with said content reception apparatus.
6 Assignments
0 Petitions
Accused Products
Abstract
A copyright of a content is protected by preventing creation of illegal copies of the content and the content is prevented from being transmitted beyond a range of personal use in a process to transmit the content through a LAN.
Before transmission of a content, a content transmission apparatus and a content reception apparatus perform a determination of authentication information available in a predetermined command accompanying authentication information, or an authentication determination based on a time until reception of a response to a predetermined command request accompanying predetermined authentication information. If the authentication is unsuccessful, the requested content is not transmitted to the content reception apparatus. With such arrangement, it is possible to effectively protect a copyright when a content is transmitted by way of a network.
-
Citations
8 Claims
-
1. A content transmission apparatus comprising:
-
an authenticator adapted
1) to perform an authentication for a content reception apparatus, and
2) to share an authentication key with said content reception apparatus when said authentication becomes successful, and
3) to send a request for transmission range acknowledgement and authentication information to said content reception apparatus, and
4) to receive a response transmitted from said content reception apparatus responding to said request for transmission range acknowledgement, and
5) to share an exchange key with said content reception apparatus;an encryptor adapted to encrypt a content to be transmitted to said content reception apparatus based on said exchange key; and a timer used for measuring a time interval between transmission of a said request for transmission range acknowledgement to said content reception apparatus and reception of said response transmitted from said content reception apparatus responding to the transmission of said request for transmission range acknowledgement; wherein, said authenticator instructs said timer to measure said time interval between said transmission of said request and said reception of said response, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content reception apparatus so that a range of the distribution of said content is limited within a house; and wherein, said response of said request for transmission range acknowledgement from said content reception apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key with said content reception apparatus. - View Dependent Claims (2, 8)
-
-
3. A content reception apparatus comprising:
-
a content-receptor adapted to receive a content transmitted by a content transmission apparatus, which is connected to said content-receptor through said network; an authenticator adapted
1) to perform an authentication for said content transmission apparatus, and
2) to share an authentication key with said content transmission apparatus when said authentication becomes successful, and
3) to send a request for transmission range acknowledgement and authentication information to said content transmission apparatus, and
4) to receive a response transmitted from said content transmission apparatus responding to said request for transmission range acknowledgement, and
5) to share an exchange key with said content transmission apparatus; anda decryptor adapted to generate a key based on said exchange key produced by said authenticator as a result of execution of an authentication process in said authenticator, and to decrypt a content transmitted by said content transmission apparatus by using said key; a timer used for measuring a time interval between transmission of a said request for transmission range acknowledgement to said content transmission apparatus and reception of a said response transmitted from said request for content transmission apparatus responding to the transmission of said transmission range acknowledgement; wherein, said authenticator instructs said timer to measure said time interval between said transmission of said request and said reception of said response, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content transmission apparatus so that a range of the distribution of said content is limited within a house; and wherein, said response of said request for transmission range acknowledgement from said content transmission apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key with said content transmission apparatus. - View Dependent Claims (4)
-
-
5. A content transmission apparatus comprising:
-
an authenticator adapted
1) to perform an authentication for a content reception apparatus, and
2) to share an authentication key with said content reception apparatus, and
3) to send a request for transmission range acknowledgement and authentication information to said content reception apparatus, and
4) to receive a response transmitted from said content reception apparatus responding to said request for transmission range acknowledgement, and
5) to share said exchange key with said content reception apparatus; anda timer used for measuring a time interval between transmission of a said request for transmission range acknowledgement to said content reception apparatus and reception of said response transmitted from said content reception apparatus responding to the transmission of said request for transmission range acknowledgement; wherein, said authenticator instructs said timer to measure said time interval between said transmission of said request and said reception of said response, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content reception apparatus so that a range of the distribution of said content is limited within a house; and wherein, said response of said request for transmission range acknowledgement from said content reception apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key with said content reception apparatus.
-
-
6. A content reception apparatus comprising:
-
an authenticator adapted
1) to perform an authentication for said content transmission apparatus, and
2) to share an authentication key with said content transmission apparatus, and
3) to send a request for transmission range acknowledgement and authentication information to said content transmission apparatus, and
4) to receive a response transmitted from said content transmission apparatus responding to said request for transmission range acknowledgement, and
5) to share an exchange key with said content transmission apparatus; anda timer used for measuring a time interval between transmission of a said request for transmission range acknowledgement to said content transmission apparatus and reception of a said response transmitted from said content transmission apparatus responding to the transmission of said request for transmission range acknowledgement; wherein, said authenticator instructs said timer to measure said time interval between said transmission of said request and said reception of said response, and if a measurement value of said time interval exceeds a predetermined value, said authenticator does not share said exchange key with said content transmission apparatus so that a range of the distribution of said content is limited within a house; and wherein, said response of said request for transmission range acknowledgement from said content transmission apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said authenticator does not share said exchange key with said content transmission apparatus.
-
-
7. A content transmission method carried out by a processing unit hardware, for transmitting a content between a content transmission apparatus and a content reception apparatus which are connected to each other by way of a network, said content transmission method comprising:
-
performing an authentication for a content reception apparatus and sharing an authentication key with said content reception apparatus; sending a request for transmission range acknowledgement and authentication information to said content reception apparatus and receiving a response from said content reception apparatus for the transmission of said request for transmission range acknowledgement; measuring a time interval between transmission of said request for transmission range acknowledgement to said content reception apparatus and reception of said response from said content reception apparatus for the transmission of said request for transmission range acknowledgement; generating an exchange key and sharing said exchange key with said content reception apparatus; and encrypting content to be transmitted to said content reception apparatus based on said exchange key; wherein, if a measurement value produced by said measuring time interval exceeds a predetermined value, said exchange key is not shared with said content reception apparatus so that a range of the distribution of said content is limited within a house; and wherein, said response of said request for transmission range acknowledgement from said content reception apparatus includes a data generated based on said authentication information and said authentication key, and if said data is incorrect, said exchange key is not shared with said content reception apparatus.
-
Specification