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公开(公告)号：AU781884B2
公开(公告)日：2005-06-23
申请号：AU4684501
申请日：2001-04-05
Applicant: SONY CORP
Inventor： ASANO TOMOYUKI , OSAWA YOSHITOMO , ISHIGURO RYUJI , MITSUZAWA ATSUSHI , OISHI TATEO
Abstract: In a tree-structural key distribution system, renewed data of a master key and medium key are sent along with a key renewal block (KRB). KRB is such that each of devices included as leaves of a tree structure has a leaf key and restricted node key. A specific KRB can be generated for a group identified by a specific node and distributed to the group to restrict a device for which the key can be renewed. Any device not belonging to the group cannot decrypt the key, whereby the security of key distribution can be assured. Especially in a system using a generation-managed master key, a master key renewed with KRB can be distributed.
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公开(公告)号：AU2005201512A1
公开(公告)日：2005-05-05
申请号：AU2005201512
申请日：2005-04-11
Applicant: SONY CORP
Inventor： MITSUZAWA ATSUSHI , ISHIGURO RYUJI , OSAWA YOSHITOMO , ASANO TOMOYUKI , OISHI TATEO
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公开(公告)号：DE69634017D1
公开(公告)日：2005-01-13
申请号：DE69634017
申请日：1996-08-16
Applicant: SONY CORP
Inventor： SAKO YOICHIRO , KAWASHIMA ISAO , OSAWA YOSHITOMO , KURIHARA AKIRA , MASUDA SHOZO
IPC: G06F1/00 , G11B7/007 , G11B20/00 , G11B27/30 , G11B27/32 , H04N5/85 , H04N5/913 , H04N9/79 , H04N9/804 , H04N21/2389 , H04N21/8358 , H04B1/66
Abstract: A signal recording/reproducing method and apparatus, a signal record medium, and a signal transmission/reception method and apparatus enable a signal recorded on a signal record medium to be identified as being an original signal or a copied signal. A CPU (11) generates, at a pre-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit (3) adds the identification signal to video signals and/or audio signals. A sector forming circuit (5) and circuit components up to a recording/reproducing head (14) record the video signals and/or the audio signals and the ancillary identification signal on an optical disc (12).
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公开(公告)号：HK1058589A1
公开(公告)日：2004-05-21
申请号：HK03109358
申请日：2003-12-23
Applicant: SONY CORP
Inventor： ASANO TOMOYUKI , OSAWA YOSHITOMO , OISHI TATEO , ISHIGURO RYUJI , TAKI RYUTA
IPC: G06F12/14 , G06F21/00 , G06F21/10 , G06F21/62 , G11B20/00 , H04L20090101 , H04L9/08 , H04L29/06 , H04N7/167
Abstract: An information processing system and method for realizing efficient processing using an enabling key block (EKB) using a categorized tree structure. An EKB composed of encrypting data for encrypting an upper-order key by using a lower-order key on a selection path of a key tree having sub-trees managed by a category entity is created and provided to a device. When a request to create an EKB is made, a structure for creating a route key by itself or a structure for requesting a key distribution center to create a route key is selectively executed. Further a structure for requesting a category entity to create a sub-EKB when the EKB distribution center creates an EKB is provided, and therefore the EKB creation and management are made efficient.
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公开(公告)号：DE69626724D1
公开(公告)日：2003-04-24
申请号：DE69626724
申请日：1996-06-27
Applicant: SONY CORP
Inventor： SAKO YOICHIRO , OWA HIDEO , OSAWA YOSHITOMO , KURIHARA AKIRA , KAWASHIMA ISAO
IPC: G11B20/10 , G06F1/00 , G11B7/00 , G11B7/004 , G11B7/0045 , G11B7/005 , G11B7/007 , G11B11/105 , G11B19/12 , G11B20/00 , G11B7/24
Abstract: An optical disk (D) has a first working area and a second working area having two recording formats. Encrypted data is recorded on the second working area. Encrypting key data is recorded on the first working area. The encrypting key data is used for decoding the encrypted data. This recording technique makes easy reproduction of the recorded data quite difficult. If data recorded on a bit-formed portion can be reproduced by any means, the data signal recorded on the optical disk cannot easily be reproduced.
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Patent Agency Ranking
公开(公告)号：DE69618101T2
公开(公告)日：2002-08-22
申请号：DE69618101
申请日：1996-07-17
Applicant: SONY CORP
Inventor： OSAWA YOSHITOMO , SAKO YOICHIRO , KURIHARA AKIRA , KAWASHIMA ISAO
Abstract: A signal reproducing apparatus, in which unauthorized decoding or copying is rendered difficult, reproduces enciphered data from a disk-shaped record medium (101) on which are recorded data enciphered by at least one encryption operation and key storage site information specifying an arraying site for at least one key information item used for deciphering the enciphered data. The apparatus includes a reproducing head device (212) for reading the enciphered data and the key storage site information from the record medium (101), a TOC decoder (219), a CPU (224) and a digital signal processing circuit (220) for decoding the enciphered data using the key information stored on the site designated in accordance with the key storage site information.
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公开(公告)号：DE69617143T2
公开(公告)日：2002-07-11
申请号：DE69617143
申请日：1996-08-16
Applicant: SONY CORP
Inventor： SAKO YOICHIRO , KAWASHIMA ISAO , OSAWA YOSHITOMO , KURIHARA AKIRA , MASUDA SHOZO
IPC: G06F1/00 , G11B7/007 , G11B20/00 , G11B27/30 , G11B27/32 , H04N5/85 , H04N5/913 , H04N9/79 , H04N9/804 , H04N21/2389 , H04N21/8358
Abstract: A signal recording/reproducing method and apparatus, a signal record medium, and a signal transmission/reception method and apparatus enable a signal recorded on a signal record medium to be identified as being an original signal or a copied signal. A CPU (11) generates, at a pre-set time interval, an identification signal having a meaning at a pre-set time interval, and an identification signal addition circuit (3) adds the identification signal to video signals and/or audio signals. A sector forming circuit (5) and circuit components up to a recording/reproducing head (14) record the video signals and/or the audio signals and the ancillary identification signal on an optical disc (12).
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公开(公告)号：CA2372510A1
公开(公告)日：2001-10-18
申请号：CA2372510
申请日：2001-04-04
Applicant: SONY CORP
Inventor： ASANO TOMOYUKI , MITSUZAWA ATSUSHI , OISHI TATEO , OSAWA YOSHITOMO , ISHIGURO RYUJI
Abstract: An effective key block (EKB) used for key distribution structure of tree structure is re-structured to a simplified two-branch or multi-branch tree i n which a decodable end node or leaf is at the lowest layer so as to create a re- structured layered tree according to only a key corresponding to the node or leaf of the re-structured layered tree. A tag as identification data about t he tree position of an encryption key stored in the EKB is stored. In the tag, not only the position identification but data for judging if encryption key data is present in the EKB is stored. The amount of data in the EKB is great ly reduced and the decoding by a device is simplified. Thus, providing an information processing system and method enabling reduction of the amount of data in an Effective key block (EKB) used for an encryption key structure of tree structure.
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公开(公告)号：NO332239B1
公开(公告)日：2012-08-06
申请号：NO20015908
申请日：2001-12-03
Applicant: SONY CORP
Inventor： ISHIGURO RYUJI , OSAWA YOSHITOMO , OISHI TATEO , ASANO TOMOYUKI , MITSUZAWA ATSUSHI
IPC: G06F12/14 , H04L9/08 , G06F1/00 , G06F21/10 , G06F21/62 , G06Q20/00 , G11B20/00 , G11B20/10 , G11B20/12
Abstract: A content key, an authentication key, and a program data etc. are transmitted with an enabling key block (EKB) in an encrypted key constitution of a tree structure. The EKB has a constitution in which a device as a leaf of the tree holds a leaf key and a limited node key, and a specific enabling key block (EKB) is generated and distributed to a group specified by a specific node to limit devices that can be renewed. As the devices that do not belong to the group cannot perform decryption, the security for distributing keys etc. can be secured. Thus, distribution of various kinds of keys or data is executed in an encryption key constitution of a tree structure to realize an information processing system and method enabling to distribute data efficiently and safely.
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公开(公告)号：BRPI0613956A2
公开(公告)日：2011-02-22
申请号：BRPI0613956
申请日：2006-06-27
Applicant: MATSUSHITA ELECTRIC IND CO LTD , SONY CORP , MASAYA YAMAMOTO , TOSHIHISA NAKANO , KAORU MURASE , KOZUKA MASAYUKI , YAMANISHI TAKASHI
Inventor： OSAWA YOSHITOMO , YONEMITSU JUN , MURAMATSU KATSUMI , ONODA SENICHI , OISHI TATEO , YAMAMOTO MASAYA , NAKANO TOSHIHISA , MURASE KAORU , KOZUKA MASAYUKI , YAMANISHI TAKASHI
IPC: G06F21/22
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