Patent ID: 8767773

Claim:
A system for preventing a leak of personal information, the system comprising: a packet receiver configured to receive a packet comprising a plurality of fields including one or more field which includes personal information of an individual; a non-transitory computer readable medium including computer executable instructions stored thereon which, when executed by a computer, perform the following steps: determining whether modification information about schemes of modifying the one or more field which includes personal information has been input; selecting input modification information if modification information has been input; selecting stored modification information if no modification information has been input; and modifying the one or more field which includes personal information according to the selected input modification information or the selected stored modification information; a storage unit configured to store the modification information; and a packet transmitter configured to transmit the packet comprising the modified field, wherein the schemes of modifying the one or more field which includes personal information include a scheme of modifying a value in the one or more field including personal information to be a predetermined value, a scheme of deleting the personal information, or a scheme of encrypting the personal information, and wherein the one or more field which includes personal information includes at least one of a source IP address or a destination IP address.