US20100042840A1 - Content sharing system and method - Google Patents

Content sharing system and method Download PDF

Info

Publication number
US20100042840A1
US20100042840A1 US12/603,777 US60377709A US2010042840A1 US 20100042840 A1 US20100042840 A1 US 20100042840A1 US 60377709 A US60377709 A US 60377709A US 2010042840 A1 US2010042840 A1 US 2010042840A1
Authority
US
United States
Prior art keywords
right object
key
contents
temporary
content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/603,777
Inventor
Keiko Watanabe
Jun Sato
Toru Terauchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to US12/603,777 priority Critical patent/US20100042840A1/en
Publication of US20100042840A1 publication Critical patent/US20100042840A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Technology Law (AREA)
  • Computer Hardware Design (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Information Transfer Between Computers (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Storage Device Security (AREA)

Abstract

According to an aspect of the invention, there is provided a content sharing system including a first device configured to acquire a right object; a second device configured to acquire a content of the right object from the first device; a session key generation unit provided in the first device and the second device and configured to generate a session key based on mutual authentication; a temporary right object generation unit provided in the first device and configured to generate a temporary right object from the right object by using the session key to supply the generated temporary right to the second device; and a content play unit provided in the second device and configured to receive the temporary right object to play the content of the right object acquired from the first device by using the temporary right object.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • The present application is a Divisional Application of U.S. application Ser. No. 11/606,807 filed Nov. 30, 2006, which is based on and claims the benefit of priority from the prior Japanese Patent Application No. 2006-244485, filed on Sep. 8, 2006; the entire contents of both of which are incorporated herein by reference.
    • BACKGROUND
  • 1. Technical Field
  • The present invention relates to a content sharing system and method which can play contents without being connected to a right issuing server.
  • 2. Description of Related Art
  • In OMA DRM v2 (Open Mobile Alliance Digital Rights Management version 2), it is defined that devices perform a process of joining/unjoining to/from a domain through a server in order to share rights.
  • JP-A-2005-92851 discloses a system in which license information includes identifiers corresponding to two or more devices capable of using contents, and the identifiers are extracted from the license information when receiving contents. In the system, the contents may be played when the extracted identifier matches to that of the corresponding device. Also, in the system disclosed in JP-A-2005-92851, devices share the contents through a server.
    • SUMMARY
  • According to an aspect of the invention, there is provided a content sharing system including: a first device configured to acquire a right object; a second device configured to acquire a content of the right object from the first device; a session key generation unit provided in the first device and the second device and configured to generate a session key based on mutual authentication; a temporary right object generation unit provided in the first device and configured to generate a temporary right object from the right object by using the session key to supply the generated temporary right to the second device; and configured to receive the temporary right object to play the content of the right object acquired from the first device by using the temporary right object and a content play unit provided in the second device.
  • According to another aspect of the invention, there is provided a content sharing method for a content sharing system that includes a first device configured to acquire a right object and a second device configured to acquire a content of the right object from the first device, the content sharing method comprising: performing mutual authentication between the first device and the second device; generating a session key based on the mutual authentication; generating, in the first device, a temporary right object from the right object by using the session key and supplying the generated temporary right object to the second device; receiving, in the second device, the temporary right object and playing a content of the right object acquired from the first device by using the received temporary right object.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an exemplary diagram showing the configuration of a content sharing system according to an embodiment of the invention.
  • FIG. 2 is an exemplary view showing a process of temporally sharing contents of the content sharing system according to the embodiment.
  • FIG. 3 is an exemplary flow chart showing a process of acquiring a right object of the content sharing system according to the embodiment.
  • FIG. 4 is an exemplary view showing a process of generating a right object and encrypted contents generated in the content sharing system according to the embodiment.
  • FIG. 5 is an exemplary flow chart showing a process of acquiring a temporary right object of the content sharing system according to the embodiment.
  • FIG. 6 is an exemplary view showing a process of generating a temporary right object in the content sharing system according to the embodiment.
  • FIG. 7 is an exemplary view showing a process of generating a temporary right object in the content sharing system according to a modified embodiment of the invention.
    •  DESCRIPTION OF THE EMBODIMENTS
  • Hereinafter, a content sharing system and method according to embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components will be denoted by the same reference numerals and thus description thereof will be omitted.
  • FIG. 1 is a diagram showing the configuration of a content sharing system according to an embodiment of the invention. The content sharing system includes a first device 11 and a second device 12. The first device 11 acquires right objects from a rights issuing server 20. The rights issuing server 20 has the configuration as a server computer. In the rights issuing server 20, a right object RO issued from a right issuing unit 22 and contents E-C, corresponding to the right object RO, encrypted by a contents supply unit 23 are supplied to devices such as the first and second devices through a communication unit 21.
  • As indicated by P1 in FIG. 2, it is shown that the rights issuing server 20 provides the right object RO issued by the issuing unit 22 and the encrypted contents E-C corresponding to the right object supplied by the contents supply unit 23 to the first device 11.
  • The first and second devices 11 and 12 may be a terminal such as a mobile phone and have the same configuration. Meanwhile, the second device 12 serves as a temporary right object receiver. The second device 12 does not serve as a temporary right object generation unit or a division unit. Hereinafter, the first device 11 will be representatively described.
  • FIG. 1 shows an example of the configuration of the first device that includes a control unit 30-1, a communication unit 31-1, an input unit 32-1 having keys and/or a camera, an output unit 33-1 having a display unit, a speaker and a microphone, and a storage unit 34-1 in which the program and/or acquired contents are stored.
  • The control unit 30-1 includes a session key generation unit 35-1, a temporary right object generation unit 36-1, a contents play unit 37-1, and a division unit 38-1.
  • The session key generation unit 35-1 executes mutual authentication process with a desired device and generates a session key. As indicated by P2 in FIG. 2, the session key generation unit 35-1 generates a session key Ks with respect to the first and second devices 11 and 12. The temporary right object generation unit 36-1 generates a temporary right object ROs from the right object RO using the session key Ks and sends the generated temporary right object ROs to the desired devices. In FIG. 2, the temporary right object ROs is sent (moved) from the first device 11 to the second device 12. The contents play unit 37-2 receives the temporary right object ROs and plays the contents corresponding to the right object acquired from the first device 11 using the temporary right object ROs. In FIG. 2, encrypted contents E-C are supplied from the first device 11 to the second device 12 by being copied or streamed. The contents play unit 37-2 plays the right object contents E-C acquired from the first device 11 using the temporary right object ROs.
  • The division unit 38-1 divides the contents corresponding to right object and supplies the divided contents to other devices. When the contents corresponding to right object are divided and then supplied, the temporary right object generation unit 36-1 generates and supplies the temporary right object to one or a plurality of divided parts of the contents. At this time, the temporary right object generation unit 36-1 may generate and supply the different temporary right object to one or the plurality of division parts.
  • Hereinafter, the procedure in which the first device 11 which acquires the right object from the rights issuing server 20 and supplies the temporary right object to the second device 12 so as to share the contents in the content sharing system having the above-described configuration.
  • As shown in a flow chart of FIG. 3, the first device 11 performs a registration process with respect to the rights issuing server 20 and exchanges public keys (step S11). The first device 11 receives a right object RO bound to the first device 11 and encrypted contents E-C from the rights issuing server 20 (step S12).
  • FIG. 4 shows a process of generating the right object RO and the encrypted contents E-C. As shown in FIG. 4, the rights issuing server 20 stores internal secret information 51 having public key information KPUB — A of the first device 11 and a secret key KPRI — RI of the rights issuing server 20. Further, when issuing the right object RO, the rights issuing server 20 generates a validation key KMAC, a key-encryption key KREK, and a content key KCEK and performs the encryption using an encryption program E.
  • The content key KCEK is applied to the encryption program E so as to acquire the contents E-C encrypted by encrypting contents C. The validation key KMAC and the key-encryption key KREK are encrypted using the public key information KPUB — A so as to generate the right object RO, thereby acquiring an encryption sentence 52 which consists of the validation key KMAC and the key-encryption key KREK. When the content key KCEK is encrypted using the key-encryption key KREK, an encryption sentence 53 of the content key is acquired. A signature 54 that is a signature of a right holder obtained by encrypting the right information 55 using the secret key KPRI — RI. The signature 54 may be omitted. Further, a MAC value 57 may be acquired by applying the validation key KMAC to a hash function 56 with respect to the right information 55, the signature 54, the encryption sentence 53 of the content key, and the encryption sentence 52 which includes the validation key KMAC and the key-encryption key KREK. The above-described MAC value 57, the right information 55, the signature 54, the encryption sentence 53 of the content key, and the encryption sentence 52 which includes the validation key KMAC and the key-encryption key KREK are issued as the right object RO.
  • As shown in a flow chart of FIG. 5, the first and second devices 11 and 12 execute mutual authentication process by setting up a section so as to acquire a session key KS (step S21). The first device 11 generates the temporary right object ROS from the right object RO using the session key KS and supplies the generated temporary right object ROS with the encrypted contents E-C to the second device 12 (step S22). The contents E-C may be supplied to the second device 12 by allowing the first device 11 to copy the encrypted contents E-C and store the copied encrypted contents E-C in the second device 12 as a first method or allowing the first device 11 to supply the encrypted contents E-C to the second device 12 in a streaming manner as a second method. In the case of using the second method, it is possible to share only a part of the contents with the second device 12 by limiting a range of the streaming.
  • FIG. 6 shows a process of generating the temporary right object ROS. As shown in the left portion of FIG. 6, the first device 11 has the encrypted contents E-C and holds right object RO having the MAC value 57, the right information 55, the signature 54, the encryption sentence 53 of the content key, and the encryption sentence 52 which includes the validation key KMAC and the key-encryption key KREK. Further, the first device 11 has the internal secret information 61 including a secret key KPRI — A and the session key KS of the first device 11.
  • Thereafter, the encrypted contents E-C is sent. A part of the right object RO is encrypted again to generate the temporary right object ROS. The encryption sentence 52 which consists of the validation key and the key-encryption key is decoded using the secret key KPRI — A of the first device 11 so as to acquire the validation key KMAC and the key-encryption key KREK. The validation key KMAC and the key-encryption key KREK are encrypted using the session key KS so as to acquire an encryption sentence 62 which consists of the key-encryption key and the validation key. The encryption sentence 53 of the content key is set without change. The right information 55 may be assigned without being divided or assigned by being divided. In FIG. 6, divided right information (1) is assigned. The divided right information (1) 65 is controlled to be generated once or have a play time for one minute from the time of starting the play. With respect to the right information (1), the signature 64 which indicates the signature of the first device 11 is acquired using the secret key KPRI — A. As described above, the signature 64 may be omitted.
  • A MAC value 67 may be acquired by applying the validation key KMAC to a hash function 66 with respect to the right information (1) 65, the signature 64, the encryption sentence 63 of the content key, and the encryption sentence 62 which includes the validation key and the key-encryption key. The above-described MAC value 67, the right information (1) 65, the signature 64, the encryption sentence 63 of the content key, and the encryption sentence 62 which includes the validation key and the key-encryption key are issued as the temporary right object ROS (1). A temporary right object ROS (2) indicates, for example, a temporary right object issued next to the temporary right object ROS (1).
  • In the second device 12 which receives the encrypted contents E-C, the temporary right object ROS (1), and the temporary right object ROS (2), and so on, an encryption sentence 62 which consists of the key-encryption key and the validation key are decoded using the session key KS, thereby acquiring the key encryption key KREK and an encryption sentence 53 is decoded using the key encryption key KREK, thereby acquiring the content key KCEK. The contents E-C encrypted by the content key KCEK is decoded, played within a range permitted by the right information, and output from the output unit 33-2.
  • As described above, the contents of the temporary right object ROS (1), the temporary right object ROS (2), and the like can be temporally shared by controlling a play function thereof. The first device 11 may communicate with the second device 12 when generating the session key KS or receiving the contents and the temporary right object ROS. Even when it is difficult that the first device 11 communicates with the second device 12, the contents can be temporally shared.
  • In the above description, it is assumed that the server that issues the right object RO is the same as the server that issues the encrypted contents E-C. However, the server may be divided into a server (right issuing server) that issues the right object RO and a server (content server) that issues the encrypted contents E-C.
  • Further, the contents according to the embodiment of the present invention may be not contents issued by a server (or content server). For example, the contents may be generated by another device. That is, it is not important where from the contents is issued but that the contents are permitted to be shared between devices.
  • FIG. 7 shows a process of generating a temporary right object ROS according to a modified embodiment of the invention. In this configuration, the encrypted contents E-C is divided into contents E-C1, E-C 2, . . . and then is sent. A part of the right object RO is encrypted again to generate a temporary right object ROS. This method is the same as the method shown in FIG. 6. The right information 55 may be divided and then assigned or be assigned without being dividing and then transmitted (moved).
  • In the modification of the invention, since the contents E-C is divided into contents E-C1, E-C 2, . . . and then is sent, if the divided parts are not received, it is difficult to play the contents even though there are lots of temporary objects ROS. Therefore, it is possible to temporally share the contents. Further, the second device 12 is decoded as the example described in FIG. 6.
  • In the above-described embodiment, the content key 53 is not changed. However, the content key 53 may be changed whenever the transmission is performed. In the modified embodiment, the changed content key is encrypted using the key-encryption key KREK and allocated. When the changed content key is transmitted, the right for play is provided such that the corresponding contents can be temporally shared. In the modified embodiment of the invention, it is desired that the first device 11 can communicate with the second device 12 when generating a session key KS or receiving the contents and temporary right object ROS. However, even though the first device 11 can not communicate with the second device 12, it is possible to temporally share contents.
  • According to the above-embodiments, the mutual authentication is performed between the first device and the second device, a session key is generated, a temporary right object is generated from the right object using the session key in the first device and the generated temporary right object is supplied to the second device, and the temporary right object is received and the right object content acquired from the first device is played using the received temporary right object in the second device. Therefore, the second device may temporally use contents without registration to a right issuing server. Accordingly, even when the first device and the second device are moved to a region where the first device and the second device can not be registered in the right issuing server, it is possible to supply contents from the first device without being connected to the right issuing server.

Claims (1)

1. A content sharing system comprising:
a first device configured to acquire a right object;
a second device configured to acquire a content corresponding to the right object from the first device;
a session key generation unit provided in the first device and the second device and configured to generate a session key based on mutual authentication;
a temporary right object generation unit provided in the first device and configured to generate a temporary right object from the right object by using the session key to supply the generated temporary right to the second device; and
a content play unit provided in the second device and configured to receive the temporary right object to play the content of the right object acquired from the first device by using the temporary right object.
US12/603,777 2006-09-08 2009-10-22 Content sharing system and method Abandoned US20100042840A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/603,777 US20100042840A1 (en) 2006-09-08 2009-10-22 Content sharing system and method

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JPP2006-244485 2006-09-08
JP2006244485A JP2008065696A (en) 2006-09-08 2006-09-08 Content sharing system and method
US11/606,807 US7630940B2 (en) 2006-09-08 2006-11-30 Content sharing system and method
US12/603,777 US20100042840A1 (en) 2006-09-08 2009-10-22 Content sharing system and method

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/606,807 Division US7630940B2 (en) 2006-09-08 2006-11-30 Content sharing system and method

Publications (1)

Publication Number Publication Date
US20100042840A1 true US20100042840A1 (en) 2010-02-18

Family

ID=38873571

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/606,807 Expired - Fee Related US7630940B2 (en) 2006-09-08 2006-11-30 Content sharing system and method
US12/603,777 Abandoned US20100042840A1 (en) 2006-09-08 2009-10-22 Content sharing system and method

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US11/606,807 Expired - Fee Related US7630940B2 (en) 2006-09-08 2006-11-30 Content sharing system and method

Country Status (3)

Country Link
US (2) US7630940B2 (en)
EP (1) EP1898329A2 (en)
JP (1) JP2008065696A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080184350A1 (en) * 2006-09-07 2008-07-31 Lg Electronics, Inc. Method and terminal of verifying membership for moving rights object in domain
US20090198993A1 (en) * 2008-01-31 2009-08-06 Pantech&Curitel Communications, Inc. Method for joining user domain and method for exchanging information in user domain

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090004217A (en) * 2007-07-06 2009-01-12 현대자동차주식회사 The compatible system of digital-contents copyright
EP2192772B1 (en) * 2007-08-24 2015-08-12 Mitsubishi Electric Corporation Limited reception apparatus
KR100973576B1 (en) * 2008-03-26 2010-08-03 주식회사 팬택 Method and device for generating right object, method and device for transferring right object and method and device for receiving right object
CN101572705B (en) * 2009-06-08 2012-02-01 西安西电捷通无线网络通信股份有限公司 System and method for realizing bi-directional platform authentication
US9015856B2 (en) * 2011-08-08 2015-04-21 Facebook, Inc. Mobile-device user authentication
WO2013120100A1 (en) * 2012-02-10 2013-08-15 Contentguard Holdings, Inc. Method, apparatus, and computer-readable medium for content access authorization
KR101402956B1 (en) * 2012-09-24 2014-06-02 웹싱크 주식회사 Method and system of providing authorization in dm server
SE538304C2 (en) 2014-10-09 2016-05-03 Kelisec Ab Improved installation of a terminal in a secure system
SE539271C2 (en) * 2014-10-09 2017-06-07 Kelisec Ab Mutual authentication
SE542460C2 (en) 2014-10-09 2020-05-12 Kelisec Ab Improved security through authenticaton tokens
FR3090254B1 (en) * 2018-12-12 2022-12-16 Idemia France Secure access to encrypted data from a user terminal
WO2023136585A1 (en) * 2022-01-12 2023-07-20 남기원 Blockchain-based secondary creative work management system and method therefor

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08263438A (en) * 1994-11-23 1996-10-11 Xerox Corp Distribution and use control system of digital work and access control method to digital work
US6973445B2 (en) * 2001-05-31 2005-12-06 Contentguard Holdings, Inc. Demarcated digital content and method for creating and processing demarcated digital works
JP4155393B2 (en) * 2002-06-17 2008-09-24 富士通株式会社 File exchange apparatus, personal information registration / introduction server, transmission control method, and program
US20050004873A1 (en) * 2003-02-03 2005-01-06 Robin Pou Distribution and rights management of digital content
US20060053080A1 (en) * 2003-02-03 2006-03-09 Brad Edmonson Centralized management of digital rights licensing
US20060053079A1 (en) * 2003-02-03 2006-03-09 Brad Edmonson User-defined electronic stores for marketing digital rights licenses
KR20040107602A (en) * 2003-06-05 2004-12-23 삼성전자주식회사 License Management System And Method for Playing Contents in Home Network
KR20060032998A (en) * 2003-07-08 2006-04-18 마츠시타 덴끼 산교 가부시키가이샤 Information input/output system
KR100493904B1 (en) 2003-09-18 2005-06-10 삼성전자주식회사 Method for DRM license supporting plural devices
US20060008256A1 (en) * 2003-10-01 2006-01-12 Khedouri Robert K Audio visual player apparatus and system and method of content distribution using the same
JP4624235B2 (en) * 2004-10-28 2011-02-02 三洋電機株式会社 Content usage information providing apparatus and content usage information transmission method
CA2626244A1 (en) * 2005-10-18 2007-04-26 Intertrust Technologies Corporation Methods for evaluating licenses containing control programs by a drm engine
US7792756B2 (en) * 2006-06-27 2010-09-07 Microsoft Corporation Subscription management in a media sharing service
US20080066181A1 (en) * 2006-09-07 2008-03-13 Microsoft Corporation DRM aspects of peer-to-peer digital content distribution

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080184350A1 (en) * 2006-09-07 2008-07-31 Lg Electronics, Inc. Method and terminal of verifying membership for moving rights object in domain
US20090198993A1 (en) * 2008-01-31 2009-08-06 Pantech&Curitel Communications, Inc. Method for joining user domain and method for exchanging information in user domain
US8856510B2 (en) * 2008-01-31 2014-10-07 Pantech Co., Ltd. Method for joining user domain and method for exchanging information in user domain

Also Published As

Publication number Publication date
JP2008065696A (en) 2008-03-21
EP1898329A2 (en) 2008-03-12
US7630940B2 (en) 2009-12-08
US20080082445A1 (en) 2008-04-03

Similar Documents

Publication Publication Date Title
US7630940B2 (en) Content sharing system and method
US8336105B2 (en) Method and devices for the control of the usage of content
US8214912B2 (en) Method and apparatus for temporarily using DRM contents
US8850230B2 (en) Cloud-based movable-component binding
JP5556895B2 (en) Content data reproducing apparatus, update management method, and update management program
US8181266B2 (en) Method for moving a rights object between devices and a method and device for using a content object based on the moving method and device
KR100746030B1 (en) Method and apparatus for generating rights object with representation by commitment
US9928350B2 (en) Digital rights management
US20040162846A1 (en) Content use management system
US20080010207A1 (en) Information delivery system, node device, method to issue unrestricted data, and the like
US20090313471A1 (en) Extending the drm realm to external devices
KR20130056342A (en) Secure and efficient content screening in a networked environment
US20090183000A1 (en) Method And System For Dynamically Granting A DRM License Using A URL
KR20060015547A (en) Method of storing revocation list
WO2009088758A1 (en) Method and apparatus for digital rights management protection for removable media
WO2020244408A1 (en) Data management method, apparatus and system, and readable storage medium
US20090119784A1 (en) Out of band license acquisition including content identification
JP2010531511A (en) Content sharing method and system using removable storage
CN102215131A (en) Management method and device of functional License
JP2004240959A (en) Contents reproducing device, license issue server and contents reproducing system
US9237310B2 (en) Method and system digital for processing digital content according to a workflow
CN101667995B (en) Method and system for managing digital copyright, hardware security unit and computer
CN115115384A (en) Processing method and device of excitation event, electronic equipment and storage medium
KR20090022832A (en) Certificate system for device and method thereof
EP2083370A2 (en) Method and system for dynamically granting a DRM license using a URL

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION