摘要:
In a content reproduction apparatus according to the present invention, for example, a content usage time indicating a usage permitted time of content is set for the content, and a content reproduction management unit 811 manages a usage state and a rewind limit position of the content. Here, the rewind limit position is a position which indicates that the content cannot be reproduced till the end in the case where a user executes a rewind operation. For example, in the case where the user attempts to execute the rewind operation on the part that is in front of the rewind limit position, the content management unit 811 notifies the user of a warning message in advance.
摘要:
A digital content distribution system (1) is composed of a right management server (100) and a user terminal (110) which are connected via a transmission line (120). The right management server (100) is made up of: a license data generating unit (304) which issues license data (usage right information) (1700) indicating a usage rule of content that is a digital copyrighted work to the user terminal (110); and an access condition setting unit (305) which notifies the user terminal (110) of update information (access condition) regarding necessity of updating the license data (1700) issued to the user terminal (110). The user terminal (110) is made up of: a content DB (701) which stores content; a license data DB (702) which stores the license data (1700) issued by the license data generating unit (304); a content reproducing unit (710) which uses the content stored in the content DB (701) in accordance with the usage rule indicated by the license data (1700) stored in the license data DB (702); and a license data upgrading unit (706) which requests the right management server (100) to update the license data (1700) stored in the license data DB (702) in accordance with the access condition notified by the access condition setting unit (305).
摘要:
A user terminal (110) having a license purchase unit (603) obtaining a license (500) indicating a content usable time (502) of a content data (200) composed of a plurality of elements (203), each of which can be replayed individually. The user terminal (110) also having an availability judgment unit (604) judging whether or not encrypted elements (203) included in the content data (200) are available, based on the content usable time (502) indicated in the obtained license (500), and having a replay/display unit (607) replaying the encrypted elements judged as available. In addition, the user terminal (110) having a use status management unit (608) specifying license-consuming elements, each of which consumes an authorized amount of replay under right, out of the elements that are being replayed, and measuring a content used time (504) consumed by replaying the specified license-consuming elements.
摘要:
The user terminal (110) is composed of the following: a license purchase unit (603) for obtaining a license (500) indicating a content usable time (502) of a content data (200) composed of a plurality of elements (203), each of which can be replayed individually; an availability judgment unit (604) for judging whether or not encrypted elements (203) included in the content data (200) are available, based on the content usable time (502) indicated in the obtained license (500); a replay/display unit (607) for replaying the encrypted elements judged as available; and a use status management unit (608) for specifying license-consuming elements, each of which consumes an authorized amount of replay under right, out of the elements that are being replayed, and measuring a content used time (504) consumed by replaying the specified license-consuming elements.
摘要:
The present invention provides a rights management terminal that can securely send and receive usage information while preventing spoofing and protecting user's privacy. The rights management terminal manages a copyright of a content using a license that includes a usage rule of the content, and includes: a first public key certificate management unit which manages, as a set, a first public key certificate that includes identification information for uniquely identifying at least one of the rights management terminal and a user using the terminal, and a first private key paired with a first public key included in the first public key certificate; a second public key certificate management unit which manages, as a set, a second public key certificate that does not include the identification information, and a second private key paired with a second public key included in the second public key certificate; a selection processing unit that selects, as a set, one of the following: the first public key certificate and the first private key; and the second public key certificate and the second private key; and an authentication processing unit that executes authentication for communicating with a server apparatus, using the public key and the private key that are selected as a set by the selection processing unit.
摘要:
The transmission format A license conversion unit (430) of the terminal device (120) converts the transmission format license (710), which is obtained from the license relay server (110), described in a transmission format into a processing format license (510) to be specified by the conversion format specification information (711) and detects modifications on the license whose format has already been converted by performing a signature verification on the after-conversion processing format license (510) using a processing format signature (712).
摘要:
When a secure counter malfunction detection unit 212 deters a malfunction in a secure counter 211, a content playability judgment unit 206 performs a content playability judgment based on information managed by a malfunctioning-state playback processing management unit 214. The malfunctioning-state playback processing management unit 214 stores a malfunctioning-state playback condition composed of information such as a playback count and a playback time. The content playability judgment unit 206 judges that content is playable when the malfunctioning-state playback condition is met, and a content playback unit 210 splays the content.
摘要:
When a secure counter malfunction detection unit 212 deters a malfunction in a secure counter 211, a content playability judgment unit 206 performs a content playability judgment based on information managed by a malfunctioning-state playback processing management unit 214. The malfunctioning-state playback processing management unit 214 stores a malfunctioning-state playback condition composed of information such as a playback count and a playback time. The content playability judgment unit 206 judges that content is playable when the malfunctioning-state playback condition is met, and a content playback unit 210 splays the content.
摘要:
A contents using device (or a terminal device) 300 is composed of: a license processing unit 305 which judges, on the basis of a usage rule of a license, whether or not the content is available; a content reproduction unit 304 which uses the content judged by the terminal device 300 to be available; a restriction unit (or a content reproduction unit 304) which restricts the license corresponding to the contents from being used by another source by reason that the license is currently in use, for a time period between a start and a normal end of the content usage by the content reproduction unit 304; an event detection unit 307 which detects a predetermined event that occurs between the start and the normal end of the content usage and that forcefully aborts the content usage; a restriction-relaxation necessity judgment unit (or a recovery/penalty judgment unit) 309 which judges whether or not the predetermined event is against an intention of a user; and a restriction relaxation unit (or a license recovery unit) 306 which relaxes the restriction on the content usage when the recovery/penalty judgment unit 309 judges that the predetermined event is against the intention of the user.
摘要:
To provide a content distribution system which can prevent use of content which has been temporarily stored after the valid period.A content distribution system (1) including a license server (101) which issues a license, a content server (102) which transmits the content, a terminal device (103) which controls use of the content based on the issued license. The terminal device (103) does not allow the use of the received encrypted content when it is judged that the encrypted content received from the content server (102) is not the content received in real time.