Patents by Inventor Tadaaki Tonegawa

Tadaaki Tonegawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8051302
    Abstract: Encrypted music data and additional information necessary for accessing a server (30) are copied from a CD-ROM (200) onto a memory card (110). The memory card (110) 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 (AC1) for limiting the number of accesses to the memory card from the server (30).
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: November 1, 2011
    Assignees: Fujitsu Limited, Sanyo Electric Co., Ltd.
    Inventors: Masayuki Hatanaka, Jun Kamada, Takahisa Hatakeyama, Takayuki Hasebe, Seigou Kotani, Takeaki Anazawa, Tadaaki Tonegawa, Junji Nakata, Toshiaki Hioki, Miwa Kanamori, Yoshihiro Hori
  • Patent number: 7945517
    Abstract: A memory card (110) stores access restriction information (AC1) to a license information hold unit (1440) arranged in a TRM area. Access restriction information (AC1) has information for example of a frequency of reproduction allowed and a number of licenses owned. A controller (1420) in reproducing and transferring content initially confirms access restriction information (AC1) and thereafter effects reproduction and transfer and after the reproduction and transfer are effected updates access restriction information (AC1), as required, for storage in a license information hold unit (1440).
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: May 17, 2011
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited, Renesas Electronics Corporation
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Masataka Takahashi, Takayuki Hasebe, Makoto Yoshioka, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Patent number: 7747538
    Abstract: A memory card 110 extracts a session key Ks from the data applied onto a data bus BS3 by carrying out a decryption process. An encryption processing unit 1406 encrypts a public encryption key KPcard(1) of memory card 110 based on session key Ks, and applies the encrypted key to a server via data bus BS3. A memory 1412 receives 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 BS3 for storage.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: June 29, 2010
    Assignees: Fujitsu Limited, Renesas Technology Corp., Sanyo Electric Co., Ltd.
    Inventors: Masayuki Hatanaka, Jun Kamada, Takahisa Hatakeyama, Takayuki Hasebe, Seigou Kotani, Shigeki Furuta, Takeaki Anazawa, Tadaaki Tonegawa, Toshiaki Hioki, Miwa Kanamori, Toshihiro Hori
  • Patent number: 7599890
    Abstract: A memory card (110) includes a memory (1415) to store encrypted content data, a license hold unit (1440) to store at least a portion of license information distributed by a distribution system, a plurality of authentication data hold units (1400.1, 1400.2), 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 (SW2) 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 (110).
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: October 6, 2009
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited, Hitachi, Ltd.
    Inventors: Yoshihiro Hori, Hiroshi Takemura, Takatoshi Yoshikawa, Toshiaki Hioki, Takahisa Hatakeyama, Takayuki Hasebe, Shigeki Furuta, Masataka Takahashi, Takeaki Anazawa, Tadaaki Tonegawa
  • Patent number: 7383446
    Abstract: 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.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: June 3, 2008
    Assignees: Fujitsu Limited, Hitachi, Ltd., Sanyo Electric Co., Ltd.
    Inventors: Masayuki Hatanaka, Jun Kamada, Takahisa Hatakeyama, Takayuki Hasebe, Seigou Kotani, Tadaaki Tonegawa, Takeaki Anazawa, Toshiaki Hioki, Miwa Kanamori, Yoshihiro Hori
  • Patent number: 7340055
    Abstract: A memory card (110) conducts an authentication process with a server based on data stored in an authentication data hold unit (1400). The memory card (110) extracts a first session key (Ks1) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS3). The memory card (110) generates a second session key (Ks2) through a session key generation unit (1418), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks2) and a key (KPm(1)) unique to the memory card (110) in an encrypted state with the first session key (Ks1). The transaction ID and the second session key (Ks2) stored in the log memory (1460) are used in the redistribution process.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: March 4, 2008
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited, Hitachi, Ltd.
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Masataka Takahashi, Takayuki Hasebe, Shigeki Furuta, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Patent number: 7219227
    Abstract: A license server (10) includes a CRL database (306) 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 (315) 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 (315) in distributing content also transmits information for updating the revocation list in the memory card.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: May 15, 2007
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited, Hitachi, Ltd.
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Masataka Takahashi, Takayuki Hasebe, Shigeki Furuta, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Patent number: 7158641
    Abstract: A memory card (110) decodes data delivered to a data bus (BS3) and extracts a session key (Ks1) sent from a server from the data. Based on the session key (Ks1), an encrypting section (1406) encrypts a public encryption key (KPm (1)) of the memory card (110) and delivers it to a server through the data bus (BS3). The memory card (110) receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm (1)) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K(1)), and stores it in a memory (1415).
    Type: Grant
    Filed: November 29, 2000
    Date of Patent: January 2, 2007
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Seigou Kotani, Takayuki Hasebe, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Publication number: 20060116969
    Abstract: A memory card 110 extracts a session key Ks from the data applied onto a data bus BS3 by carrying out a decryption process. An encryption processing unit 1406 encrypts a public encryption key KPcard(1) of memory card 110 based on session key Ks, and applies the encrypted key to a server via data bus BS3. A memory 1412 receives 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 BS3 for storage.
    Type: Application
    Filed: November 1, 2005
    Publication date: June 1, 2006
    Applicants: FUJITSU LIMITED, NIPPON COLUMBIA CO., LTD., HITACHI, LTD., SANYO ELECTRIC CO., LTD.
    Inventors: Masayuki Hatanaka, Jun Kamada, Takahisa Hatakeyama, Takayuki Hasebe, Seigou Kotani, Shigeki Furuta, Takeaki Anazawa, Tadaaki Tonegawa, Toshiaki Hioki, Miwa Kanamori, Yoshihiro Hori
  • Patent number: 6999948
    Abstract: A memory card 110 extracts a session key Ks from the data applied onto a data bus BS3 by carrying out a decryption process. An encryption processing unit 1406 encrypts a public encryption key KPcard(1) of memory card 110 based on session key Ks, and applies the encrypted key to a server via data bus BS3. A memory 1412 receives 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 BS3 for storage.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: February 14, 2006
    Assignees: Fujitsu Limited, Nippon Columbia Co., Ltd., Hitachi, Ltd., Sanyo Electric Co., Ltd.
    Inventors: Masayuki Hatanaka, Jun Kamada, Takahisa Hatakeyama, Takayuki Hasebe, Seigou Kotani, Shigeki Furuta, Takeaki Anazawa, Tadaaki Tonegawa, Toshiaki Hioki, Miwa Kanamori, Yoshihiro Hori
  • Patent number: 6898708
    Abstract: A cellular phone (100) stores encrypted content data and encrypted license key distributed thereto in a memory card (110). The cellular phone (100) and the memory card (110) collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card (110) is decrypted by a first decryption processing portion (1510) with a session key (Ks4), and is further decrypted by a second decryption processing portion (1514) with a system symmetric key (Kcom) for extraction. A third encryption processing portion (1516) decrypts the encrypted content data read from memory card (110) with the license key (Kc) to reproduce content data (Data).
    Type: Grant
    Filed: December 6, 2000
    Date of Patent: May 24, 2005
    Assignees: Sanyo Electric Co., Ltd., Fujitsu Limited
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Takayuki Hasebe, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Publication number: 20040010467
    Abstract: A memory card (110) includes a memory (1415) to store encrypted content data, a license hold unit (1440) to store at least a portion of license information distributed by a distribution system, a plurality of authentication data hold units (1400.1, 1400.2), 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 (SW2) 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 (110).
    Type: Application
    Filed: September 30, 2002
    Publication date: January 15, 2004
    Inventors: Yoshihiro Hori, Hiroshi Takemura, Takatoshi Yoshikawa, Toshiaki Hioki, Takahisa Hatakeyama, Takayuki Hasebe, Shigeki Furuta, Masataka Takahashi, Takeaki Anazawa, Tadaaki Tonegawa
  • Publication number: 20020191764
    Abstract: A memory card (110) stores access restriction information (AC1) to a license information hold unit (1440) arranged in a TRM area. Access restriction information (AC1) has information for example of a frequency of reproduction allowed and a number of licenses owned. A controller (1420) in reproducing and transferring content initially confirms access restriction information (AC1) and thereafter effects reproduction and transfer and after the reproduction and transfer are effected updates access restriction information (AC1), as required, for storage in a license information hold unit (1440).
    Type: Application
    Filed: June 4, 2002
    Publication date: December 19, 2002
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Masataka Takahashi, Takayuki Hasebe, Makoto-shi Yoshioka, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Publication number: 20020184492
    Abstract: A license server (10) includes a CRL database (306) 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 (315) 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 (315) in distributing content also transmits information for updating the revocation list in the memory card.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Masataka Takahashi, Takayuki Hasebe, shigeki Furuta, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Publication number: 20020183985
    Abstract: A cellular phone (100) stores encrypted content data and encrypted license key distributed thereto in a memory card (110). The cellular phone (100) and the memory card (110) collectively perform a part of mutual authentication processing upon power-on. The encrypted license key (Kc) read from the memory card (110) is decrypted by a first decryption processing portion (1510) with a session key (Ks4), and is further decrypted by a second decryption processing portion (1514) with a system symmetric key (Kcom) for extraction. A third encryption processing portion (1516) decrypts the encrypted content data read from memory card (110) with the license key (Kc) to reproduce content data (Data).
    Type: Application
    Filed: June 6, 2002
    Publication date: December 5, 2002
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Takayuki Hasebe, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa
  • Publication number: 20020184154
    Abstract: A memory card (110) conducts an authentication process with a server based on data stored in an authentication data hold unit (1400). The memory card (110) extracts a first session key (Ks1) from a server by a decryption process and a transaction ID from the data applied on a data bus (BS3). The memory card (110) generates a second session key (Ks2) through a session key generation unit (1418), and transmits to the server, as the keys to encrypt content data in receiving decryption of content data, the second session key (Ks2) and a key (KPm(1)) unique to the memory card (110) in an encrypted state with the first session key (Ks1). The transaction ID and the second session key (Ks2) stored in the log memory (1460) are used in the redistribution process.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Takatoshi Yoshikawa, Hiroshi Takemura, Masataka Takahashi, Takayuki Hasebe, Shigeki Furuta, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Annazawa
  • Publication number: 20020184513
    Abstract: A memory card (110) decodes data delivered to a data bus (BS3) and extracts a session key (Ks1) sent from a server from the data. Based on the session key (Ks1), an encrypting section (1406) encrypts a public encryption key (KPm (1)) of the memory card (110) and delivers it to a server through the data bus (BS3). The memory card (110) receives data including a license key (Kc) and a license (ID) encrypted with the public encryption key (KPm (1)) different with memory card to memory card, decrypts the data, encrypted it again with uniquely given secret key (K(1)), and stores it in a memory (1415).
    Type: Application
    Filed: May 30, 2002
    Publication date: December 5, 2002
    Inventors: Yoshihiro Hori, Toshiaki Hioki, Miwa Kanamori, Seigou Kotani, Takayuki Hasebe, Takahisa Hatakeyama, Tadaaki Tonegawa, Takeaki Anazawa