Fujitsu Corporation

Sanyo Electric Co., Ltd.

Hitachi, Ltd.

Renesas Technology Corp.

Nippon Columbia Co., Ltd.

Seigou Kotani

Takayuki Hasebe

Toshiaki Hioki

Takahisa Hatakeyama

Miwa Kanamori

Takeaki Anazawa

Yoshihiro Hori

Jun Kamada

Masayuki Hatanaka

Tadaaki Tonegawa

Shigeki Furuta

Junji Nakata

Toshihiro Hori

Taizou Kinoshita

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 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 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 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.

Growing community of inventors

Kawasaki, Japan

Seigou Kotani