Abstract: An imaging apparatus, which is capable of recording a still image during a moving image recording operation, includes a display unit, an operation unit configured to receive an instruction from a user, and a controller configured to control the display unit to display information about a number of recordable still image data, when the operation unit receives a predetermined instruction during a moving image recording operation.

Abstract: When a technique for specifying an unauthorized terminal based on a combination of watermarks embedded in content distributed without authorization is applied to content distributed on recording media, recording capacity limits of the recording media lead to a limit on the number of combinations of watermarks that can be embedded in the content, and only a limited number of terminals can be specified. In the present invention, all terminals are sorted into the same number of groups as there are combinations of watermarks, and a group that includes an unauthorized terminal can be specified based on the combination of watermarks embedded in the content. When the group including the unauthorized terminal is specified, this group is divided into groups, and a plurality of groups that do not include the unauthorized terminal are integrated. This enables the unauthorized terminal to be specified while keeping within the capacity of the recording medium.

Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: An imaging apparatus includes an information acquiring unit operable to acquire information representing a state of a recoding medium from the recording medium, a determining unit operable to determine the state of the recording medium based on the information acquired by the information acquiring unit, and an informing unit operable to inform result of the determination by the determining unit to an outside of the imaging apparatus.

Abstract: A content playback apparatus (digital watermark detection apparatus) comprises: a detection unit operable to detect a digital watermark from audio data having a plurality of blocks, the audio data being contained in a content which is to be played back along a playback time-line; a detected block storage unit for storing therein information indicating a block in which the digital watermark has been detected by the detection unit; and a playback control unit operable to play back all data contained in the content other than audio data corresponding to the block indicated by the information stored in the detected block storage unit. This makes it possible, even when audio data containing copyright information is inadvertently recorded on a camcorder, to prevent the audio data containing the copyright information from being played back, thereby enabling users to view the content without the influence of playback control.

Abstract: An imaging apparatus includes an image generation unit operable to generate image signal of a subject, a recording unit operable to record a first type of image file or a second type of image file to a recording medium based on the image signal generated by the image generation unit, and a controller operable to control the recording unit. The controller controls the recording unit to record the first type of image file at a lower level of a first directory in the recording medium and record the second type of image file at a lower level of a second directory in the recording medium, and record in the recording medium information used to analyze a recording order of the first type of image file and the second type of image file in the recording medium, while relating the information to the second type of image file.

Abstract: An executing device conducts playback of contents. The executing device is equipped with a highly efficient processor and reduces the processing load involved in verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the executing device is capable of improving the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: Provided is a new-type recordable DVD medium characterized in having medium characteristics not defined in the DVD-R standards and-having compatibility with the DVD-ROM standards. Since information on the new-type recordable DVD medium can be played back by an existing player, even when content data protected by CSS (Content Scrambling System) is recorded on the new-type recordable DVD medium, the recordable DVD medium can be used for content distribution service using a kiosk terminal.

Abstract: An executing device for conducting playback is high during the playback of contents. The executing device is equipped with a highly efficient processor and reduces the processing load involved in verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units constituting encrypted contents recorded on a DVD. In addition, the executing device is capable of improving the accuracy of detecting unauthorized contents by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: A virtual machine can be implemented by anyone because the interface and other information necessary for implementation are publicly available. Hence, if virtual machine is implemented maliciously, a program operating thereon can be made to operate maliciously instead of operating legitimately. By comparing secret information held in memory and specific to the virtual machine with verification information which a program holds itself, the program verifies that the virtual machine on which it is running has been legitimately implemented and excludes illegitimate virtual machines.

Abstract: The present invention aims at providing a playback apparatus that performs playback control so as to prevent, in playback of content recorded on a recording medium, a decline of the value of the recording medium and content. In the case of having failed in reading of content data from the recording medium, as well as in the case of determining the necessity of content data replacement, the playback apparatus of the present invention acquires, from the distribution server, pieces of partial content data corresponding to locations at and following the reading failure, as well as pieces of replacement content data corresponding to locations whose data needs to be replaced. The playback apparatus plays back content data recorded on the recording medium and partial content data and replacement content data acquired from the content distribution server.

Abstract: A recording medium provided with a lead-in area and a data recording area, wherein position information indicating the position of the key information is stored in the lead-in area and key information to be used for managing the copyrights of content is recorded in the data recording area. As a result, a read device can acquire the key information in the data recording area by referring to the position information in the lead-in area, even if the read device lacks a way of handling a file system to be used in the data recording area. Moreover, software for reproduction of the content can acquire the key information in the data recording area using the file system.

Abstract: To provide a data generating device capable of preventing unauthorized extraction of plaintext content between decryption processing and digital watermark embedment processing. A content reproducing device B102 to which the present invention relates obtains restoration information and, in accordance with the restoration information, selectively performs predetermined restoration processing and processing of embedding device unique information, on content data at a position shown by the restoration information.

Abstract: When a technique for specifying an unauthorized terminal based on a combination of watermarks embedded in content distributed without authorization is applied to content distributed on recording media, recording capacity limits of the recording media lead to a limit on the number of combinations of watermarks that can be embedded in the content, and only a limited number of terminals can be specified. In the present invention, all terminals are sorted into the same number of groups as there are combinations of watermarks, and a group that includes an unauthorized terminal can be specified based on the combination of watermarks embedded in the content. When the group including the unauthorized terminal is specified, this group is divided into groups, and a plurality of groups that do not include the unauthorized terminal are integrated. This enables the unauthorized terminal to be specified while keeping within the capacity of the recording medium.

Abstract: A virtual machine can be implemented by anyone because the interface and other information necessary for implementation are publicly available. Therefore, it is possible that by implementing the virtual machine illegitimately, programs run thereon on will be made to operate illegitimately instead of legitimately. A program compares secret information held by the virtual machine with verification information held by the program itself. The program thereby verifies whether the virtual machine that runs the program is implemented legitimately, and is able to reject an illegitimate virtual machine.

Abstract: The present invention provides a content reproduction terminal which can be transformed between a general-purpose terminal and a members-only terminal. A content reproduction terminal 30a is composed of: an IC card slot into which a card 20a distributed to a membership user is to be inserted; an application/display-data acquisition unit 304a which sets the operation mode on the basis of a membership certificate 2020 showing a group, to which the user belongs, held previously in the card 20a; and a resident player application execution unit 305a and a member player application execution unit 308a which reproduce the content differently depending on the setting result given by the application/display-data acquisition unit 304a.

Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units consisting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: Processing load on an executing device for conducting playback is high during the playback of contents since the executing device performs verification of the contents validity in parallel with the contents playback, and therefore the executing device has to be equipped with a highly efficient processor. The present invention reduces the processing load involved in the verification by using, for the verification, only a predetermined number of encrypted units selected randomly from multiple encrypted units consisting encrypted contents recorded on the DVD. In addition, the present invention is capable of improving the accuracy of detecting unauthorized contents to some extent by randomly selecting a predetermined number of encrypted units every time the verification is performed.

Abstract: The present invention provides a recording medium that allows the content provider to control messages. The recording medium is provided by a content provider and records thereon content and a program which is executed at the time of playback of the content by a playback apparatus. The program causes the playback apparatus to execute: an interacting step of interacting with a different program prestored in the playback apparatus and executed at the time of the playback of the content; and an output step of transmitting, to the different program, a message determined according to the result of the interaction.