Abstract: An unauthorized communication detection apparatus comprises: a reception module configured to receive operational data from a transmission source; a transmission module configured to transmit the operational data received by the reception module to a destination; a determination module configured to calculate a score of the operational data by a determination expression for calculating the score for determining whether the operational data is involved in unauthorized communication based on a learning model relating to a feature amount of a learning data group, and determine based on the calculated score whether the operational data is involved in unauthorized communication; and a transmission control module configured to control the transmission of the operational data performed by the transmission module based on a determination result obtained by the determination module.

Abstract: It is provided a video distribution system including a video distribution module, a control module, and a bookmark management module. The bookmark management module manages a first type bookmark whose status is not changed by viewing of the video and a second type bookmark whose status is changeable after the viewing of the video. The control module generates screen data that enables one of the first type bookmark and the second type bookmark to be selected with regard to the video stored in the library, transmits the generated screen data to the one of the receiving terminals, and sets one of the first type bookmark and the second type bookmark, which is selected by a user using the one of the receiving terminals, for the video and record the one of the first type bookmark and the second type bookmark in the bookmark management module.

Abstract: In this video delivery device including: a storage device storing key frame information including a key frame number included in a contents file and offset from the beginning of a file; and a delivery control unit, which executes delivery in a predetermined cycle, the delivery control unit refers to the key frame information cycle by cycle in executing the trick play, and transmits the key frame having the offset closest to the delivery time among the key frames included in the contents file.

Abstract: In this video delivery device including: a storage device storing key frame information including a key frame number included in a contents file and offset from the beginning of a file; and a delivery control unit, which executes delivery in a predetermined cycle, the delivery control unit refers to the key frame information cycle by cycle in executing the trick play, and transmits the key frame having the offset closest to the delivery time among the key frames included in the contents file.