| 摘要 |
If a copyrighted file is shared through a network, the present invention generates contamination file pieces corresponding to the size of a file piece in a copyrighted file service and manages the contamination file piece by storing the contamination file piece using a hash value as a key. If a file request is inputted, the present invention provides the contamination file piece corresponding to the hash value obtained by the corresponding request. [Reference numerals] (AA,CC) No; (BB,DD) Yes; (S300) Acts as a virtual peer; (S310) Standby the file request reception; (S320) Receiving the file request?; (S330) Obtain a hash value and a file piece size from the received file request; (S340) Search collision value database based on the hash value; (S350) Corresponding hash value exists?; (S360) Transmit the standby contaminated file piece; (S370) Response that no corresponding file piece exists |
