Masataka Minami

6529506, Mar 4, 2003

Oct 8, 1999

09/414726

Masaya Yamamoto - Katano, JP
Tomoyuki Nonomura - Osaka, JP
Masataka Minami - Burbank CA
Masayuki Kozuka - Arcadia CA

Matsushita Electric Industrial Co., Ltd. - Osaka

H04L 1228

370389, 370469, 382100, 713176, 725 87, 725 98

A data processing apparatus is provided with a data obtaining unit which receives a network signal sn on a network N and obtains distributed audio data Dau in which copyright information or the like is embedded, and a control unit which obtains information indicating a watermarking method which has been used when embedding the copyright information or the like in the audio data. The embedded information is extracted by an appropriate watermarking method according to the obtained information indicating the used watermarking method. The extracted information is again embedded in the distributed audio data Dau by using a predetermined watermarking method, and thus obtained audio data is recorded on a recording medium. Therefore, regardless of the watermarking method used for embedding the copyright information or the like in the distributed audio data Dau, the distributed audio data Dau can be appropriately reproduced by reproduction apparatuses as domestic electrical equipment, according to the embedded information.

6606707, Aug 12, 2003

Apr 24, 2000

09/557872

Teruto Hirota - Moriguchi, JP
Makoto Tatebayashi - Takarazuka, JP
Taihei Yugawa - Nara, JP
Masataka Minami - Burbank CA
Masayuki Kozuka - Arcadia CA

Matsushita Electric Industrial Co., Ltd. - Osaka-fu

H04L 900

713172, 713192, 713193

A semiconductor memory card comprising a control IC , a flash memory , and a ROM. The ROM holds information such as a medium ID unique to the semiconductor memory card. The flash memory includes an authentication memory and a non-authentication memory. The authentication memory can be accessed only by external devices which have been affirmatively authenticated. The non-authentication memory can be accessed by external devices whether the external devices have been affirmatively authenticated or not. The control IC includes control units and , an authentication unit and the like. The control units and control accesses to the authentication memory and the non-authentication memory , respectively. The authentication unit executes a mutual authentication with an external device.

6687683, Feb 3, 2004

Oct 8, 1999

09/415169

Shunji Harada - Osaka, JP
Masayuki Kozuka - Arcadia CA
Masataka Minami - Burbank CA
Makoto Tatebayashi - Takarazuka, JP

Matsushita Electric Industrial Co., Ltd. - Osaka-fu

G06F 1760

705 51, 705 50, 713150, 380255

A data protection system obtains data having a first content on which a first encryption has been performed and a second content on which a second encryption has been performed, the second encryption more difficult to break than the first encryption. A first content decryption unit decrypts the first content, using a first encryption method corresponding to the first encryption of the first content. A second content decryption unit decrypts the second content using a second decryption method that corresponds to the second encryption. The decrypting contents can be executed by a software, and the second content decryption unit can include one of tamperproof hardware and an apparatus that executes tamperproof software.

6732106, May 4, 2004

Dec 8, 2000

09/731831

Ryuichi Okamoto - Studio City CA
Masayuki Kozuka - Arcadia CA
Masataka Minami - Burbank CA
Mitsuhiro Inoue - Studio City CA

Matsushita Electric Industrial Co., Ltd. - Osaka

G06F 700

707100, 7071041, 705 50

The distribution server administers downloading of contents and writing in storage media. The distribution server includes the obtained rights administration database that stores information regarding rights to receive distribution of contents, and the history database that stores information regarding contents that have been distributed to the user in the past. The distribution server administers distribution of contents to each user.

6789192, Sep 7, 2004

Jun 13, 2003

10/460193

Teruto Hirota - Moriguchi, JP
Makoto Tatebayashi - Takarazuka, JP
Taihei Yugawa - Nara, JP
Masataka Minami - Burbank CA
Masayuki Kozuka - Arcadia CA

Matsushita Electric Industrial Co., Ltd. - Osaka-Fu

H04L 900

713172, 713161, 713168, 713169, 713170, 713193, 380229, 705 57, 705 67

A semiconductor memory card comprising a control IC , a flash memory , and a ROM. The ROM holds information such as a medium ID unique to the semiconductor memory card. The flash memory includes an authentication memory and a non-authentication memory. The authentication memory can be accessed only by external devices which have been affirmatively authenticated. The non-authentication memory can be accessed by external devices whether the external devices have been affirmatively authenticated or not. The control IC includes control units and , an authentication unit and the like. The control units and control accesses to the authentication memory and the non-authentication memory , respectively. The authentication unit executes a mutual authentication with an external device.

6862582, Mar 1, 2005

Dec 5, 2003

10/729186

Shunji Harada - Osaka, JP
Masayuki Kozuka - Arcadia CA, US
Masataka Minami - Burbank CA, US
Makoto Tatebayashi - Takarazuka, JP

Matsushita Electric Industrial Co., Ltd. - Osaka-fu

G06F017/60

705 51, 705 50, 713150, 380255

A data protection system obtains data having a first content on which a first encryption has been performed and a second content on which a second encryption has been performed, the second encryption more difficult to break than the first encryption. A first content decryption unit decrypts the first content, using a first encryption method corresponding to the first encryption of the first content. A second content decryption unit decrypts the second content using a second decryption method that corresponds to the second encryption. The decrypting contents can be executed by a software, and the second content decryption unit can include one of tamperproof hardware and an apparatus that executes tamperproof software.

6993133, Jan 31, 2006

Oct 8, 1999

09/414722

Tomoyuki Nonomura - Osaka, JP
Mitsuhiro Inoue - Studio City CA, US
Masataka Minami - Burbank CA, US
Masayuki Kozuka - Arcadia CA, US

Matsushita Electric Industrial Co., Ltd. - Osaka

H04L 9/00
H04L 9/32
G06F 11/30
G06F 12/14

380252, 713176, 713189, 713193

A data recording and reproduction apparatus is provided with a stream attribute decision means for deciding whether an audio data stream supplied from an outside source is compressed or not. A compression ID flag having a value according to the result of the compression decision is attached to the audio data stream, and the flag-attached audio data stream is written in a stream storage unit. Therefore, a watermark can be inserted in a compressed audio data stream after reading the compressed audio data stream from the stream storage unit, whereby the time required for writing the compressed audio data stream in the stream storage unit is reduced, and the quality of analog audio data obtained by reproducing the compressed audio data stream is prevented from being degraded.

7020636, Mar 28, 2006

Sep 5, 2002

10/234093

Motoji Ohmori - Hirakata, JP
Masataka Minami - Arcadia CA, US
Masaya Yamamoto - Hirakata, JP

Matsushita Electric Industrial, Co., Ltd. - Osaka

G06F 17/60

705 51, 705 1, 705 56, 84607, 706 23

A storage-medium rental system includes a portable storage medium to be rented to the user, a portable semiconductor memory owned by the user, a rental-shop apparatus owned by the rental agent, and a reproduction apparatus owned by the user. The storage medium prestores encrypted content which is generated by encrypting digital work by using a content encryption key. The semiconductor memory has an area for securely storing a content decryption key. The rental-shop apparatus stores a content decryption key for decrypting the encrypted content. The rental-shop apparatus writes the content decryption key to the semiconductor memory. The reproduction apparatus securely reads the content decryption key from the semiconductor memory, reads the encrypted content from the storage medium, decrypts the encrypted content by using the content decryption key, and reproduces the decrypted content.