Method and apparatus for efficiently fixing transformed part of content

An apparatus for fixing content, executing with at least one processor, the apparatus comprising:

• a checking unit which checks fixing information for a first packet of packets constituting the content, and extracts location information of a second packet of the packets from the checked fixing information,
• where the fixing information is used to fix a transformed part of the content and the second packet contains fixing data for fixing the transformed part of the content;
• and
• a fixing unit which selectively fixes the transformed part of the content based on the fixing information of the first packet checked by the checking unit,
• wherein the checking unit and the fixing unit comprise the at least one processor,
• wherein the first packet and the second packet are among program map table (PMT) packets included in the packets constituting the content, and
• wherein (a) comprises skipping the check of PMT packets between the first packet and the second packet based on the location information of the second packet.

A method of reproducing content, comprising:

• extracting forensic information inserted into the content;
• extracting information regarding a location of a packet containing the forensic information;
• extracting the forensic information from the packet present at the location;
• and
• inserting the extracted forensic information into the content,
• wherein the packet is among program map table (PMT) packets included in packets constituting the content, and
• wherein checking fixing information for the packet constituting the content comprises skipping the check of PMT packets between the packet and a different packet based on the information regarding a location.