Method and apparatus for efficiently fixing transformed part of content

1. A method of fixing content, comprising:

(a) checking fixing information contained in a first packet of packets constituting the content, the fixing information being used to fix a transformed part of the content;

(b) extracting location information of a second packet of the packets from the fixing information of the first packet checked in (a), the second packet containing fixing data for fixing the transformed part of the content; and

(c) fixing the transformed part of the content by using the fixing data in the second packet indicated by the location information extracted in (b),

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.

2. The method of claim 1 , further comprising (d) selectively fixing the transformed part of the content based on the fixing information of the first packet checked in (a).

3. The method of claim 2 , wherein when the fixing information of the first packet checked in (a) contains the fixing data, (d) comprises fixing the transformed part of the content by using the fixing data in the fixing information of the first packet checked in (a).

4. The method of claim 1 , wherein (a) comprises checking the fixing information of the first packet from a starting point, which is selected by a user, from which the content is reproduced.

5. The method of claim 1 , wherein (c) comprises:

(c1) checking the fixing information of the second packet based on the location information extracted in (b) without checking fixing information of packets present between the first packet and the second packet; and

(c2) fixing the transformed part of the content by using fixing data in the fixing information of the second packet checked in (c1).

6. The method of claim 1 , wherein the location information is relative location information from the first packet to the second packet.

7. The method of claim 6 , wherein the relative location information is a total number of packets present between the first packet and the second packet, and

(c) comprises:

(c1) checking the fixing information of the second packet present at a location corresponding to a value obtained by adding a packet number of the first packet plus one to the total number of the packets; and

(c2) fixing the transformed part of the content by using the fixing data in the fixing information of the second packet checked in (c1).

8. The method of claim 1 , further comprising:

(d) executing a security code extracted from a medium to generate fixing information for fixing the transformed part of the content; and

(e) selectively fixing the transformed part of the content based on the fixing information generated in (d) and the fixing information checked in (a).

9. The method of claim 1 , wherein the first packet and the second packet are program map table packets according to the moving picture experts group-2 standard, and

each program map table packet of the packets contains the fixing information.

10. A non-transitory computer readable medium having recorded thereon a computer program for executing the method of claim 1 .

11. 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.

12. The apparatus of claim 11 , wherein, when the fixing information of the first packet checked by the checking unit contains the fixing data, the fixing unit fixes the transformed part of the content by using the checked fixing information of the first packet.

13. The apparatus of claim 11 , wherein the checking unit checks the fixing information of the second packet based on the extracted location information, and extracts the fixing data for fixing the transformed part of the content from the checked fixing information of the second packet, and

the fixing unit fixes the transformed part of the content by using the fixing data of the second packet extracted by the checking unit.

14. The apparatus of claim 11 , wherein the checking unit checks the fixing information of the first packet which first appears from a starting point, which is selected by a user, from which the content is reproduced.

15. The apparatus of claim 11 , wherein the checking unit checks the fixing information of the second packet based on the location information extracted by the checking unit without checking the fixing information of packets present between the first packet and the second packet, and

the fixing unit fixes the transformed part of the content by using the fixing data in the fixing information of the second packet checked by the checking unit.

16. The apparatus of claim 11 , wherein the location information is relative location information from the first packet to the second packet.

17. The apparatus of claim 16 , wherein the relative location information is a total number of packets present between the first packet and the second packet,

the checking unit checks the fixing information of the second packet present at a location corresponding to a value obtained by adding a packet number of the first packet plus one to the total number of the packets, and

the fixing unit fixes the transformed part of the content by using the fixing data in the fixing information checked by the checking unit.

18. The apparatus of claim 11 , further comprising a virtual machine executing a security code extracted from a medium to generate fixing information for fixing the transformed part of the content,

wherein the fixing unit further selectively fixes the transformed part of the content based on the fixing information generated by the virtual machine and the fixing information of the first packet checked by the checking unit.

19. The apparatus of claim 11 , wherein the first and second packets are program map table packets according to the moving picture experts group-2 standard, and each program map table packet of the packets contains the fixing information.

20. 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.

21. The apparatus of claim 15 , wherein not all of the packets constituting the content contain the fixing information, and not all packets which contain the fixing information contain the fixing data therein, wherein

the checking unit only checks the fixing information of the first packet and the fixing information of other packets which contain the fixing data therein, each of the other packets being determined by the location information extracted from a previous checked packet.

22. The apparatus of claim 21 , wherein the checking unit skips checking for the fixing information of the packets present between the first packet and the second packet identified by the location information, and checks the fixing information of the second packet containing the fixing data directly after checking the fixing information of the first packet.

23. The apparatus of claim 22 , wherein the checking unit does not check for fixing information in any packets which are not the first packet or one of the other packets which contain the fixing data therein.

24. The method of claim 1 , wherein the first packet and the second packet are among a plurality of fixing packets which contain the fixing information comprising location information of a location of only a next fixing packet within a data stream, the plurality of fixing packets being separated from each other by at least one of the packets constituting the content which do not have the fixing information therein, and each next fixing packet, including the second packet, contains fixing data therein.

25. The method of claim 24 , wherein checking the fixing information comprises sequentially checking only each of the next fixing packets, including the second packet, after the first packet is checked;

the extracting the location information comprises sequentially extracting the location information of the location of the next fixing packet within the data stream from one of the next fixing packets, the next fixing packet containing the fixing data for fixing the transformed part of the content; and

the fixing the transformed part comprises fixing the transformed part of the content by applying the fixing data contained in each of the next fixing packets indicated by the location information of the location of the next fixing packet within the data stream extracted.