Abstract: Provided is a video playback system based on approval of a playback approver. A decryption key that can decrypt an encrypted and stored recorded video is generated only when video playback is approved by a playback approver using an appointed playback approval method and transmitted to the video recording device so that it is possible to prevent leakage of the recorded video with sensitive personal information.

Abstract: Provided is a video playback system based on approval of a playback approver. A decryption key that can decrypt an encrypted and stored recorded video is generated only when video playback is approved by a playback approver using an appointed playback approval method and transmitted to the video recording device so that it is possible to prevent leakage of the recorded video with sensitive personal information.

Abstract: A video recording apparatus with a pre-event circulation recording function is provided. A limitation on memory capacity may be removed by recording a pre-event video directly on a nonvolatile storage medium, such as a hard disk drive (HDD), without using a buffer according to a circulation recording method during pre-event recording performed to record videos before and after an event occurs.

Abstract: A network video recorder having a multi-stream recording function which is robust to event stream delay is provided. An event stream is recorded by adjusting a time-lapse recording end time and an event recording time to prevent omission of a video, caused by transmission delay of a high-quality event stream during the recording of the event stream.

Abstract: A network video recorder having a multi-stream recording function which is robust to event stream delay is provided. An event stream is recorded by adjusting a time-lapse recording end time and an event recording time to prevent omission of a video, caused by transmission delay of a high-quality event stream during the recording of the event stream.

Abstract: A video recording apparatus with a pre-event circulation recording function is provided. A limitation on memory capacity may be removed by recording a pre-event video directly on a nonvolatile storage medium, such as a hard disk drive (HDD), without using a buffer according to a circulation recording method during pre-event recording performed to record videos before and after an event occurs.

Abstract: Provided is a video management apparatus and a method for event recording using the same, which are capable of reducing loss of video data in an event recording. The video management apparatus performs an event recording in cooperation with a network camera to transmit a first frame with basic information of video data and a plurality of second frames with changed information of the video data. The video management apparatus includes a buffer unit to store the first and the plurality of second frames, and eliminate the stored frames according to an external control signal. The video management apparatus further includes an event recording unit to save the first frame and at least one of the second frames stored in the buffer unit, and when detecting an occurrence of events, and frames transmitted from the network camera after the detection of the occurrence of events on a storage medium.

Abstract: Provided is a video management apparatus and a method for event recording using the same, which are capable of reducing loss of video data in an event recording. The video management apparatus performs an event recording in cooperation with a network camera to transmit a first frame with basic information of video data and a plurality of second frames with changed information of the video data. The video management apparatus includes a buffer unit to store the first and the plurality of second frames, and eliminate the stored frames according to an external control signal. The video management apparatus further includes an event recording unit to save the first frame and at least one of the second frames stored in the buffer unit, and when detecting an occurrence of events, and frames transmitted from the network camera after the detection of the occurrence of events on a storage medium.

Abstract: A video recording apparatus receives real-time video data from the network camera and records the received data in a disc bank. In the apparatus, once the network is recovered from a temporary failure, a backup recording region is secured in the bank, with the size of the backup recording region corresponding to the size of video data captured by the network camera during the network failure. Then, real-time video data is recorded in a region next to the backup recording region, and video data recorded in the network camera is recorded in the backup region.

Abstract: A method of controlling a central processing unit (CPU) includes receiving a user input event; counting a time in response to the reception of the user input event; checking a processing occupancy rate; and restricting processing performance or controlling a rotation speed of a fan.