US20070288383A1 - Method and apparatus for issuing rights object required to use digital content - Google Patents

Method and apparatus for issuing rights object required to use digital content Download PDF

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Publication number
US20070288383A1
US20070288383A1 US11/741,292 US74129207A US2007288383A1 US 20070288383 A1 US20070288383 A1 US 20070288383A1 US 74129207 A US74129207 A US 74129207A US 2007288383 A1 US2007288383 A1 US 2007288383A1
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United States
Prior art keywords
rights object
digital content
key
smc
content
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Abandoned
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US11/741,292
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English (en)
Inventor
Yeo-jin KIM
Yun-sang Oh
Sang-gyoo Sim
Kyung-im Jung
Ji-soo Kim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority to US11/741,292 priority Critical patent/US20070288383A1/en
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JUNG, KYUNG-IM, KIM, JI-SOO, KIM, YEO-JIN, OH, YUN-SANG, SIM, SANG-GYOO
Publication of US20070288383A1 publication Critical patent/US20070288383A1/en
Abandoned legal-status Critical Current

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    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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    • G06Q20/00—Payment architectures, schemes or protocols
    • G06Q20/02—Payment architectures, schemes or protocols involving a neutral party, e.g. certification authority, notary or trusted third party [TTP]
    • G06Q20/027—Payment architectures, schemes or protocols involving a neutral party, e.g. certification authority, notary or trusted third party [TTP] involving a payment switch or gateway
    • H—ELECTRICITY
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    • H04L63/0442—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption
    • H—ELECTRICITY
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    • H04L63/0823—Network architectures or network communication protocols for network security for authentication of entities using certificates
    • H—ELECTRICITY
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    • H04L9/3263—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements
    • H04L9/3268—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving certificates, e.g. public key certificate [PKC] or attribute certificate [AC]; Public key infrastructure [PKI] arrangements using certificate validation, registration, distribution or revocation, e.g. certificate revocation list [CRL]
    • H—ELECTRICITY
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    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3271—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using challenge-response
    • H04L9/3273—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using challenge-response for mutual authentication
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    • H04L2209/24—Key scheduling, i.e. generating round keys or sub-keys for block encryption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04L2209/603—Digital right managament [DRM]
    • H—ELECTRICITY
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    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0853—Network architectures or network communication protocols for network security for authentication of entities using an additional device, e.g. smartcard, SIM or a different communication terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
    • H04L63/0869—Network architectures or network communication protocols for network security for authentication of entities for achieving mutual authentication

Definitions

  • the present invention relates to a method and apparatus for issuing a rights object required to use digital content, and more particularly, to a method and apparatus for issuing a rights object and capable of storing digital rights management (DRM) content, which is usually provided online, in a secure multimedia card (SMC) so that the DRM content can also be provided offline.
  • DRM digital rights management
  • DRM is a technical mechanism to protect copyright on digital content and properly charge for the use of the digital content.
  • DRM is designed to protect digital content that can be easily copied and distributed in illegal ways.
  • DRM encrypts digital content so that the digital content can be distributed in an encrypted form.
  • DRM requires a specified license called a “rights object” to use the encrypted digital content.
  • FIG. 1 illustrates a related art DRM concept.
  • a user 110 who desires to use digital content may obtain desired content from a content issuer 120 .
  • the rights object is a software object that includes information such as copyright information of content, information regarding user rights, etc.
  • the user 110 may pay a rights object issuer 130 for a rights object including the right to execute the encrypted content and obtain the rights object from the rights object issuer 130 .
  • Rights included in the rights object may include a content encryption key (CEK) required to decrypt the encrypted content.
  • CEK content encryption key
  • the rights object issuer 130 reports the details of the issuance of the rights object to the content issuer 120 .
  • the rights object issuer 130 and the content issuer 120 may be the same entity.
  • the user 110 who obtained the rights object as described above may consume the rights object and thus use the encrypted content.
  • a rights object includes limit information such as the number of times that content can be used by consuming the rights object, a period of time during which the content can be used by consuming the rights object, or the number of times that the rights object can be copied. Unlike content, the reuse or copying of a rights object is limited. Therefore, content can be effectively protected by DRM.
  • users store rights objects in various hosts, which execute multimedia data, such as a personal computer (PC), an MP3 player, a mobile phone, and a personal digital assistant (PDA). Accordingly, there is a growing need for sharing digital content between different devices.
  • multimedia data such as a personal computer (PC), an MP3 player, a mobile phone, and a personal digital assistant (PDA).
  • DRM content which is sold based on conventional DRM technology, is dependent on a particular device, it cannot be used on other devices.
  • the present invention provides a method and apparatus for issuing a rights object required to use digital content, which are capable of storing digital content and a rights object in hardware, such as a SMC, in the form of media so that the digital content can be used on various multimedia devices.
  • a method of issuing a rights object required to use digital content includes receiving the digital content and the rights object; and encrypting the rights object using a public key of an SMC and storing the encrypted rights object in the SMC.
  • a method of issuing a rights object required to use digital content includes selecting the digital content using a digital content purchase interface and paying for the digital content; encrypting a rights object for the digital content using a binding target key; and storing the encrypted rights object in an SMC.
  • a method of issuing a rights object required to use digital content includes forming a security channel with a digital content storage device after mutual authentication and receiving the rights object from the digital content storage device; and decrypting the rights object using a binding target key and providing information required to play back the digital content.
  • an apparatus for issuing a rights object required to use digital content includes a purchase interface unit which receives information regarding the digital content selected by a user, the purchase interface unit being used by the user to pay for the digital content; an encryption unit which encrypts the rights object for the digital content using a binding target key and stores the encrypted rights object in an SMC; and a communication interface unit which communicates with the SMC.
  • an apparatus for issuing a rights object required to use digital content includes a communication interface unit which forms a security channel with an SMC after mutual authentication and receives the rights object from the SMC; and a content provision unit which decrypts the rights object using a binding target key and provides information required to play back the digital content.
  • FIG. 1 illustrates a related art DRM concept
  • FIG. 2 illustrates a method of issuing a rights object required to use digital content according to an exemplary embodiment of the present invention
  • FIG. 3 illustrates a method of issuing a rights object required to use digital content according to another exemplary embodiment of the present invention
  • FIG. 4 illustrates a method of using a rights object required to use digital content according to an exemplary embodiment of the present invention
  • FIG. 5 is a block diagram of an apparatus for issuing a rights object required to use digital content according to an exemplary embodiment of the present invention.
  • FIG. 6 is a block diagram of an apparatus for using a rights object required to use digital content according to another exemplary embodiment of the present invention.
  • These computer program instructions may also be stored in a computer usable or computer readable recording medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer readable recording medium produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that are executed on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.
  • each block of the flowchart illustrations may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • a rights object stored in a SMC which is used in the exemplary embodiments of the present invention, includes information definitely needed to use DRM content and that the format of the rights object can be easily converted into formats supported by different DRM systems.
  • FIG. 2 illustrates a method of issuing a rights object required to use digital content according to an exemplary embodiment of the present invention.
  • SMC manufacturer 230 receives a digital content 221 from a content issuer 220 who provides digital content and holds copyright on the digital content, and receives a rights object 211 from a copyright issuer 210 who issues a rights object (operation S 201 ).
  • the SMC manufacturer 230 encrypts the received rights object 211 using a key of an SMC 240 , and stores the encrypted rights object 211 in the SMC 240 together with the digital content 221 (operation S 202 ).
  • the key used to encrypt the received rights object 211 may use public-key cryptography or symmetric-key cryptography.
  • Public-key cryptography also known as asymmetric-key cryptography, is a form of cryptography in which different encryption keys are used to encrypt and decrypt data.
  • an encryption key is composed of a pair of a public key and a private key.
  • the public key need not be kept secret and can be easily revealed to other devices, while the private key is revealed only to a particular device.
  • Symmetric-key cryptography also known as secret-key cryptography, is a form of cryptography in which the same encryption key is used to encrypt and decrypt data.
  • the encryption key used in operation S 202 may use any one of the public-key cryptography and the symmetric-key cryptography described above, which is not limited to the present embodiment.
  • binding To encrypt data (including a rights object and/or content in this exemplary embodiment) using a key of a specific target is called “binding,” and bound data can be decrypted by the specific target only.
  • the SMC manufacturer 230 commercializes the SMC 240 , which stores the digital content 221 and the rights object 211 , and releases it onto the market.
  • FIG. 3 illustrates a method of issuing a rights object required to use digital content according to another exemplary embodiment of the present invention.
  • an SMC 340 held by a user is inserted into an online host 330 and that the online host 330 receives one or more pieces of content from a content issuer 320 and one or more corresponding rights objects from a copyright issuer 310 .
  • a host is a device, which plays back DRM content according to rights included in a rights object, and includes an SMC connection unit.
  • An online host is an SMC-support host that can access a network and receive a rights object from a copyright issuer.
  • Examples of the online host 330 include a PC, a mobile phone, a PDA, a portable media player (PMP), and a kiosk. If a kiosk is used as the online host 330 , an SMC can be purchased at the same time when a rights object is issued, which will be described with reference to FIG. 3 .
  • the user selects and pays for desired content 321 using a content purchase interface provided by the online host 330 (operation S 301 ).
  • the content purchase interface provided by the online host 330 may include a display unit (not shown) displaying one or more content lists and/or an input unit (not shown) receiving selection of content in order to facilitate the selection of the user.
  • the content purchase interface may be connected to a settlement system (not shown) by wired and wireless networks so that the user can pay for the content 321 .
  • a rights object 311 for the paid content 321 is encrypted using a key of a binding target designated by the online host 330 (operation S 302 ).
  • the binding target may be designated according to a policy of the copyright issuer 310 .
  • the user may designate the binding target after paying for the content 321 .
  • Binding targets according to this exemplary embodiment include a card, a user, a domain and a host, and a detailed description thereof is as follows.
  • a rights object can be moved and copied when the right to move and copy the rights object is available. If a rights object is moved from a first device to a second device, the rights object is completely removed from the first device. Therefore, the rights object exists only in the second device.
  • operation S 302 if it is the copyright issuer 310 that binds the rights object 311 to a binding target, the rights object 311 is encrypted using a key of a binding target designated by the copyright issuer 310 and transmitted subsequently to the online host 330 .
  • the rights object 311 is encrypted using a key of a binding target designated by the online host 330 after the rights object 311 is issued by the copyright issuer 310 to the online host 330 .
  • the encrypted rights object 311 and the content 321 are transmitted to the online host 330 (operation S 303 ).
  • the rights object 311 may include the right to move the rights object 311 from the online host 330 to the SMC 340 , and the right may limit the rights object 311 to be moved only to a predetermined SMC.
  • the user may retrieve the SMC 340 from the online host 330 and use the content 321 by consuming the rights object 311 according to the binding target.
  • FIG. 4 illustrates a method of using a rights object required to use digital content according to an exemplary embodiment of the present invention.
  • the host 420 and the SMC 410 form a security channel after authenticating each other (operation S 401 ).
  • the SMC 410 and the host 420 can authenticate each other using a binding target.
  • the SMC 410 and the host 420 can authenticate each other using the user key in operation S 401 .
  • the present invention is not limited thereto, and the SMC 410 and the host 420 can also authenticate each other using other methods.
  • the security channel is a transmission channel formed after devices authenticate each other, and guarantees the encryption and integrity of transmission data.
  • the SMC 410 transmits the rights object 411 to the host 420 (operation S 402 ).
  • the rights object 411 transmitted to the host 420 includes the right to use the content 412 , usage limit information of the content 412 , duplication limit information of the rights object 411 , an identification (ID) of the rights object 411 , an ID of the content 412 , etc.
  • the right to use the content 412 includes a content encryption key (CEK) required to decrypt the content 412
  • CEK is a key value used by a device (the host 420 in this exemplary embodiment) to decrypt the content 412 .
  • the host 420 receives the rights object 411 from a storage device (the SMC 410 in this exemplary embodiment) storing the rights object 411 , extracts the CEK from the received rights object 411 , and decrypts the content 412 using the extracted CEK.
  • the protected content 412 can be used.
  • the usage limit information indicates a limit to which the rights object 411 can be consumed in order to execute the content 412 .
  • Types of limits contained in the usage limit information include a usage date limit, a usage frequency limit, a usage period limit, and a usage time limit.
  • the duplication limit information indicates the number of times or a degree to which the rights object 411 can be copied or moved.
  • the duplication limit information may include copy limit information and movement limit information.
  • Copying the rights object 411 denotes transmitting the rights object 411 from the existing host 420 or a first storage device (hereinafter, referred to as a source device) to another host (not shown) or a second storage device (hereinafter, referred to as a destination device) without removing the rights object 411 from the source device.
  • Moving the rights object 411 denotes transmitting the rights object 411 from the source device to the destination device while removing the rights object 411 from the source device.
  • a user can copy or move a rights object stored in a host or a portable storage device to another host or another portable storage device up to a maximum number of times that the rights object can be copied or moved, which is set in the rights object.
  • the ID of the rights object 411 is an identifier used to distinguish the rights object 411 from other rights objects
  • the ID of the content 412 is an identifier used to identify the content 412 which can be executed by consuming the rights object 411 .
  • the rights object 411 which was transmitted from the SMC 410 to the host 420 in operation S 402 , is decrypted by the host 420 using a binding target key, and the decrypted rights object 411 provides information required to play back the content 412 (operation S 403 ).
  • the binding target key used to decrypt the rights object 411 is determined according to a binding target key used to encrypt the rights object 411 .
  • Binding targets according to this exemplary embodiment include a card, a user, a domain and a host, and a detailed description thereof is as follows.
  • SMC binding a rights object is decrypted using a key of an SMC.
  • Domain binding a host, which has joined a domain, decrypts a rights object using a key of the domain.
  • the content 412 is decrypted using the CEK, which was obtained from the decrypted rights object 411 , and used by the user (operation S 404 ).
  • FIG. 5 is a block diagram of an apparatus for issuing a rights object required to use digital content according to an exemplary embodiment of the present invention.
  • a DRM apparatus 500 includes an SMC 501 , a purchase interface unit 502 , an encryption unit 503 , and a communication interface unit 504 .
  • the SMC 501 stores content, a rights object and state information of the rights object, and supports the use of the content according to copyright and copyright restrictions.
  • the purchase interface unit 502 receives information regarding content selected by a user to purchase and is used by the user to pay for the selected content.
  • the encryption unit 503 encrypts a rights object for the paid content using a designated biding target key and stores the encrypted rights object in the SMC 501 .
  • the communication interface unit 504 communicates with the SMC 501 .
  • the SMC 501 stores content, a rights object and state information of the rights object, and supports the use of the content according to copyright and copyright restrictions.
  • Examples of the SMC 501 include a memory card and a smart card.
  • the state information of the rights object indicates the degree to which the rights object has been consumed.
  • the state information may be included in the rights object.
  • a device storing the rights object may manage the state information separately from the rights object.
  • the state information of the rights object may represent the period of time during which the host has consumed the rights object so far, that is, 4 hours, or the period of time during which the host can consume the rights object and use the content, that is, 6 hours.
  • the purchase interface unit 502 receives information regarding content selected by a user to purchase, and is used by the user to pay for the selected content.
  • the purchase interface unit 502 may include an input unit (not shown) and may be connected to a separate settlement system (not shown) so that the user can pay for the content.
  • the encryption unit 503 encrypts a rights object for the content, which was paid for using the purchase interface unit 502 , using a designated binding target key, and stores the encrypted rights object in the SMC 501 via the communication interface unit 504 .
  • the communication interface unit 504 may include a predetermined contact terminal in order to contact the SMC 501 and transmit or receive data to/from the SMC 501 .
  • the communication interface unit 504 may also include a predetermined wireless communication device in order to wirelessly transmit or receive data to/from the SMC 501 without contacting the SMC 501 .
  • a binding target may be designated according to a policy of a copyright issuer.
  • the user may designate a binding target after paying for the content.
  • Binding targets according to this exemplary embodiment include a card, a user, a domain and a host, and a detailed description thereof is as follows.
  • a rights object can be moved or copied, when the right to move or copy the rights object is available. If a rights object is moved from a first device to a second device, the rights object is completely removed from the first device. Therefore, the rights object exists only in the second device.
  • the rights object is encrypted by the encryption unit 503 using a key of a binding target designated by the copyright issuer and transmitted subsequently to an online host.
  • the rights object is encrypted using a key of a binding target designated by the online host after the rights object is issued by the copyright issuer.
  • FIG. 6 is a block diagram of an apparatus for using a rights object required to use digital content according to another exemplary embodiment of the present invention.
  • a DRM apparatus 600 includes an SMC 601 , a communication interface unit 602 , and a content provision unit 603 .
  • the SMC 601 stores content, a rights object and state information of the rights object, and supports the use of the content according to copyright and copyright restrictions.
  • the communication interface unit 602 forms a security channel with the SMC 601 after mutual authentication and receives a rights object from the SMC 601 .
  • the content provision unit 603 decrypts the received rights object using a binding target key and provides information needed to play back content.
  • the SMC 601 included in the DRM apparatus 600 of FIG. 6 is identical to the SMC 501 included in the DRM apparatus 500 of FIG. 5 , and thus a detailed description thereof will not be repeated.
  • the communication interface unit 602 forms a security channel with the SMC 601 after mutual authentication, and receives a rights object from the SMC 601 .
  • the communication interface unit 602 may include a predetermined contact terminal in order to contact the SMC 601 and transmit or receive data to/from the SMC 601 .
  • the communication interface unit 602 may also include a predetermined wireless communication device in order to wirelessly transmit or receive data to/from the SMC 601 without contacting the SMC 601 .
  • the DRM apparatus 600 illustrated in FIG. 6 forms the security channel with the SMC 601 using the communication interface unit 602 , and receives a rights object.
  • the security channel is a transmission channel formed after devices authenticate each other and guarantees the encryption and integrity of transmission data.
  • the content provision unit 603 decrypts the received rights object using a binding target key, and provides information required to play back content.
  • the content provision unit 603 determines a binding target key, which is to be used to decrypt the received rights object, according to a binding target key used to encrypt the rights object.
  • Binding targets according to this exemplary embodiment include a card, a user, a domain and a host, and a detailed description thereof is as follows.
  • SMC binding a rights object is decrypted using a key of an SMC.
  • Domain binding a host, which has joined a domain, decrypts a rights object using a key of the domain.
  • the content provision unit 603 obtains a CEK from the decrypted rights object, and decrypts the content so that the user can use the content.
  • FIGS. 5 and 6 may be implemented as, but is not limited to, a software or hardware component, such as a Field Programmable Gate Array (FPGA) or Application Specific Integrated Circuit (ASIC), which performs certain tasks.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit
  • Each component may advantageously be configured to reside on the addressable storage medium and configured to execute on one or more processors.
  • a component may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • components such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
  • the functionality provided for in the components may be combined into fewer components or further separated into additional components.
  • a method and apparatus for issuing a rights object required to use digital content provide at least one of the following advantages.
  • content and a rights object are kept in hardware, such as an SMC, in the form of media, the possession value of digital content media and the convenience of content management are provided.
  • content can be used on various multimedia devices.
  • DRM content Since consumers are able to purchase DRM content, which is usually sold online, offline, the digital content market can expand its consumer base by absorbing consumers who are not familiar with the Internet.
  • a rights object issued to an SMC includes information definitely needed to use DRM content, different DRMs can be supported. Therefore, a playback area of digital content can be easily expanded.
US11/741,292 2006-05-12 2007-04-27 Method and apparatus for issuing rights object required to use digital content Abandoned US20070288383A1 (en)

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US11/745,816 Abandoned US20070265981A1 (en) 2006-05-12 2007-05-08 Method of transfering rights object and electronic device
US11/745,675 Expired - Fee Related US8340297B2 (en) 2006-05-12 2007-05-08 Method and apparatus for efficiently providing location of contents encryption key
US11/746,410 Abandoned US20070266208A1 (en) 2006-05-12 2007-05-09 Apparatus and method of setting rights object mapping table
US11/747,346 Expired - Fee Related US7854010B2 (en) 2006-05-12 2007-05-11 Method and apparatus for searching rights object and mapping method and mapping apparatus for the same
US11/747,623 Expired - Fee Related US8261073B2 (en) 2006-05-12 2007-05-11 Digital rights management method and apparatus
US11/747,935 Expired - Fee Related US8196208B2 (en) 2006-05-12 2007-05-14 Method and apparatus for creating and applying secure file identifier of rights object by using random numbers
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US11/745,675 Expired - Fee Related US8340297B2 (en) 2006-05-12 2007-05-08 Method and apparatus for efficiently providing location of contents encryption key
US11/746,410 Abandoned US20070266208A1 (en) 2006-05-12 2007-05-09 Apparatus and method of setting rights object mapping table
US11/747,346 Expired - Fee Related US7854010B2 (en) 2006-05-12 2007-05-11 Method and apparatus for searching rights object and mapping method and mapping apparatus for the same
US11/747,623 Expired - Fee Related US8261073B2 (en) 2006-05-12 2007-05-11 Digital rights management method and apparatus
US11/747,935 Expired - Fee Related US8196208B2 (en) 2006-05-12 2007-05-14 Method and apparatus for creating and applying secure file identifier of rights object by using random numbers
US15/067,662 Active US9853953B2 (en) 2006-05-12 2016-03-11 Method of transferring rights object and electronic device

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