Fujitsu Corporation

Sanyo Electric Co., Ltd.

Hitachi, Ltd.

Renesas Electronics Corporation

Renesas Technology Corp.

Nippon Columbia Co., Ltd.

Takeaki Anazawa

Takayuki Hasebe

Toshiaki Hioki

Takahisa Hatakeyama

Yoshihiro Hori

Miwa Kanamori

Tadaaki Tonegawa

Shigeki Furuta

Seigou Kotani

Jun Kamada

Masayuki Hatanaka

Takatoshi Yoshikawa

Hiroshi Takemura

Masataka Takahashi

Makoto Yoshioka

Taizou Kinoshita

Junji Nakata

Toshihiro Hori

Encrypted music data and additional information necessary for accessing a server () are copied from a CD-ROM () onto a memory card (). The memory card () receives via a digital portable phone network the distribution of a contents decoding key (Kc) necessary for decoding encrypted music data and control information data (AC) for limiting the number of accesses to the memory card from the server ().

Data distributing system and recording medium used for it

A memory card () stores access restriction information (AC) to a license information hold unit () arranged in a TRM area. Access restriction information (AC) has information for example of a frequency of reproduction allowed and a number of licenses owned. A controller () in reproducing and transferring content initially confirms access restriction information (AC) and thereafter effects reproduction and transfer and after the reproduction and transfer are effected updates access restriction information (AC), as required, for storage in a license information hold unit ().

Data distribution system and recording device for use therein

A memory cardextracts a session key Ks from the data applied onto a data bus BSby carrying out a decryption process. An encryption processing unitencrypts a public encryption key KPcard() of memory cardbased on session key Ks, and applies the encrypted key to a server via data bus BS. A memoryreceives from a server data such as license key Kc, license ID data License-ID and user ID data User-ID encrypted with a public encryption key KPcard() differing for each memory card for storage, and receives encrypted content data [Dc]Kc encrypted with license key Kc from data bus BSfor storage.

Memory card

A memory card () includes a memory () to store encrypted content data, a license hold unit () to store at least a portion of license information distributed by a distribution system, a plurality of authentication data hold units (), each storing a plurality of authentication data that are authenticated respectively by a plurality of public authentication keys KPma, KPmb common to the distribution system, and a switch (SW) to selectively provide the data from the plurality of authentication data hold units outside of said recording apparatus according to a request external to the memory card ().

Content data storage

A memory card includes a user ID hold unit holding user ID data provided to identify the user of the memory card, a first protection information memory unit holding first protection information restricting access to memory card, and a second protection information memory unit holding second protection information restricting access for each content data. Memory card refers to the user ID data to identify the user of the reproduction apparatus of interest and prohibits any unauthorized user from changing first and second protection information.

Recording device

A memory card () conducts an authentication process with a server based on data stored in an authentication data hold unit (). The memory card () extracts a first session key (Ks) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS). The memory card () generates a second session key (Ks) through a session key generation unit (), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks) and a key (KPm()) unique to the memory card () in an encrypted state with the first session key (Ks). The transaction ID and the second session key (Ks) stored in the log memory () are used in the redistribution process.

Memory card and data distribution system using it

A license server () includes a CRL database () holding a revocation list recording therein classes predetermined corresponding respectively to a memory device, such as a memory card, and a content reproduction circuit, such as a cellular phone, that are subjected to revocation of distributing, reproducing and transferring content data. A distribution control unit () suspends an operation distributing content data if the distribution is addressed to a class listed on the revocation list. The revocation list is also held in the memory card and distribution control unit () in distributing content also transmits information for updating the revocation list in the memory card.

Data distribution system and recording device and data provision device used therefor

A cellular phone has distributed encrypted content data and an encrypted content key stored in a memory. The encrypted content key data read out from the memory is decrypted by a decryption processing unit using key data Kp stored in a Kp hold unit, and then applied to a audio reproduction module. A decryption processing unit decrypts encrypted content data read out from the memory using a content key Kc extracted by the decryption processing unit to reproduce content data Dc.

Data reproduction apparatus and data reproduction module

A memory card performs decryption processing to extract a session key from data applied from a server to a data bus over a cellular phone network. An encryption processing unit encrypts a public encryption key of memory card based on a session key, and applies the same to the server via data bus. A register receives and stores data such as a decrypted license ID and a user ID from the server, and a memory receives and stores encrypted content data applied from a data bus and encrypted with a license key.

Data distribution system as well as data supply device terminal device and recording device for the same

A memory card () decodes data delivered to a data bus (BS) and extracts a session key (Ks) sent from a server from the data. Based on the session key (Ks), an encrypting section () encrypts a public encryption key (KPm ()) of the memory card () and delivers it to a server through the data bus (BS). The memory card () receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm ()) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K()), and stores it in a memory ().

Recorder

A memory cardextracts a session key Ks from the data applied onto a data bus BSby carrying out a decryption process. An encryption processing unitencrypts a public encryption key KPcard(1) of memory cardbased on session key Ks, and applies the encrypted key to a server via data bus BS. A memoryreceives from a server data such as license key Kc, license ID data License-ID and user ID data User-ID encrypted with a public encryption key KPcard(1) differing for each memory card for storage, and receives encrypted content data [Dc]Kc encrypted with license key Kc from data bus BSfor storage.

A cellular phone () stores encrypted content data and encrypted license key distributed thereto in a memory card (). The cellular phone () and the memory card () collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card () is decrypted by a first decryption processing portion () with a session key (Ks), and is further decrypted by a second decryption processing portion () with a system symmetric key (Kcom) for extraction. A third encryption processing portion () decrypts the encrypted content data read from memory card () with the license key (Kc) to reproduce content data (Data).

Growing community of inventors

Tokyo, Japan

Takeaki Anazawa