1. An apparatus for preventing replay attacks, the apparatus comprising: an acquisition unit for, when a request for operating a digital content is received, acquiring current location information of a set of placeholder files; a determination unit for determining whether the current location information is consistent with recorded location information of the placeholder file; a protection unit for, when the determination unit determines inconsistency, preventing an operation on the digital content, wherein there is a correspondence between the digital content and the set of placeholder files.