Patent ID: 9253530
Filing Date: 2016-02-02
CPC Classification: H04L,H04N

Claim Text:
1. A stream data management method comprising: generating an original stream data item including a plurality of original data items arranged in chronological order, that each include a plurality of pieces of partial information arranged in chronological order and are divided by a predetermined time unit by using a stream data generation terminal, storing in a sequence header of any one of the original data items a terminal ID indicating the stream data generation terminal and date-and-time information that is guaranteed by a third party at a time when the original stream data item is generated, generating a characteristic value using the last piece of partial information in chronological order of the preceding original data item, and storing the generated characteristic value in a sequence header of the next original data item, the characteristic value uniquely showing the partial information; generating signature-related information of the original data item by adding the contents of the sequence header including the terminal ID and the date-and-time information for the original data item having the sequence header in which the terminal ID and the date-and-time information are stored, while generating signature-related information of the original data item by adding the contents of the sequence header including the characteristic value of the last piece of partial information of the preceding original data item for the other original data items; cutting out a portion of the original stream data item, producing a cutout data item by adding a sequence header including the terminal ID, the date-and-time information and the characteristic value of the last piece of partial information of the preceding original data item to each of the original data items including the cutout portion, and generating a cutout stream data item consisting of the cutout data items; generating the signature-related information of the cutout data item that includes the terminal ID and the date-and-time information when the cutout data item is in the original data item having the sequence header in which the terminal ID and the date-and-time information are stored, while generating the signature-related information of the cutout data item that includes the characteristic value of the last piece of partial information of the preceding original data item in other cases; and verifying the originality and actual time of the cutout stream data item on the basis of the cutout stream data item, the signature-related information of each cutout data item in the cutout stream data item and the signature-related information of each original data item in the original stream data item.