1. A method for use in a wireless digital rights management system, wherein a content provider delivers protected digital content, comprising: when unauthorized holding of a pirated copy of the protected digital content is detected, based on the gateway controlling ability of a wireless operator within the wireless digital right management system, embedding in or removing from a specific fingerprint the protected digital content so as to trace suspected persons and further identify a pirate, wherein said specific fingerprint being related to the information about a suspected person who holds the protected digital content without authorization; when the wireless gateway in which the content provider is located or to which the content provider is related, receives the protected digital content to be forwarded, judging whether a sender or a recipient of the forwarded content is the suspected person based on whether the sender or recipient of the forwarded content once held a corresponding version of the pirated digital content; when the recipient of the digital content is a suspected person, the gateway in which the content provider is located or to which the content provider is related, embedding a fingerprint in the digital content, wherein said fingerprint is related to said suspected person as the recipient; when the sender of the forwarded digital content is a suspected person, the gateway in which the content provider is located or to which the content provider is related removing the embedded fingerprint from the digital content, wherein said fingerprint being related to the suspected person as the sender; and identifying the pirate who leaks the content based on tracing the content version that contains the fingerprint related to the suspected person.