Watermarking method and apparatus for tracking hacked content and method and apparatus for blocking hacking of content using the same

1. A watermarking method for tracking hacking, the method comprising:

obtaining content sharing order information, wherein the content sharing order information indicates a sequential order in which content has been previously shared by a plurality of different devices;

generating watermark data comprising the obtained content sharing order information;

and

generating watermarked multimedia content by inserting the generated watermark data into the content,

wherein the generated watermarked multimedia content comprises device information of each of the plurality of different devices which previously shared the content.

2. The method of claim 1 , further comprising obtaining device information regarding a device with which content is shared through a network channel, wherein the obtaining the device information comprises receiving the device information from the device through the network channel.

3. The method of claim 1 , further comprising obtaining device information regarding a device with which content is shared through a network channel, wherein the obtaining the device information comprises receiving first device information from the For discussion purposes only do not enter device through the network channel and transmitting second device information to the device through the network channel.

4. The method of claim 1 , further comprising transmitting the watermarked content to a reception device, with which the content is shared, through the network channel.

5. The method of claim 1 , further comprising obtaining device information with which content is shared through a network channel, wherein the device information comprises at least one of a transmission device ID corresponding to a transmission device from which the content is transmitted and a reception device ID corresponding to a reception device to which the content is transmitted.

6. The method of claim 1 , wherein the watermark data comprises at least one of transmission device information corresponding to a transmission device from which the content is transmitted and reception device information corresponding to a reception device to which the content is transmitted.

7. The method of claim 1 , wherein the generating the watermarked data and the generating the watermarked multimedia content are performed by each subsequent device sharing the content.

8. The method of claim 1 , further comprising:

obtaining device information with which content is shared through a network channel;

and

establishing a look-up table for the obtained device information.

9. The method of claim 1 , further comprising forming a watermark domain for inserting the device information.

10. The method of claim 1 , wherein the generating the watermarked multimedia content comprises inserting the generated watermark data into a specific location for inserting device-related information in the content.

11. The method of claim 6 , wherein reception device information corresponding to the reception device is omitted from the generated watermark data.

12. A watermarking apparatus for tracking hacking, the apparatus comprising:

a decoder which decodes content of a content bit stream;

a watermark generator which generates watermark data by including sharing order

information, wherein the content sharing order information indicates a sequential order in which content has been previously shared by a plurality of different devices;

a watermark inserting unit which generates watermarked content by inserting the watermark data generated by the watermark generator into the content decoded by the decoder,

the generated watermarked content comprising device information of each of the plurality of different devices which previously shared the content; and

an encoder which encodes the watermarked content generated by the watermark inserting unit to generate a watermarked content bit stream.

13. The apparatus of claim 12 , further comprising a communicating unit which transmits device information to the reception device connected through a determined network and transmits the generated watermarked content bit stream to the reception device.

14. A watermarking method for tracking hacking, the method comprising:

transmitting, by a user device to a content providing apparatus, device information regarding the user device through a network channel; and

receiving, by the user device from the content providing apparatus, watermarked multimedia content generated by inserting watermark data into the content, the watermark data being generated by including content order sharing information,

wherein the content sharing order information indicates a sequential order in which the content has been previously shared by a plurality of different devices, and

wherein the generated watermarked multimedia content comprises device information of each of the plurality of different devices which previously shared the content.

15. A non-transitory computer-readable recording medium having embodied thereon a program for executing a method comprising:

obtaining content sharing order information, wherein the content sharing order information indicates a sequential order in which content has been previously shared by a plurality of different devices;

generating watermark data comprising the obtained content sharing order information;

and

generating watermarked multimedia content by inserting the generated watermark data into the content,

wherein the generated watermarked multimedia content comprises device information of each of the plurality of different devices which previously shared the content.