The present invention performs content copyright management using a public IP address currently used by a user computer for accessing the Internet network, so that a user who has justly downloaded the content from the IPTV set-top box is not only an IPTV set-top box, but also a personal computer (PC). You can use the contents as it is on other computers that you own. Accordingly, content copyright management can be reasonably performed without excessively restricting the rights of the content user, and the convenience of the content user can be achieved.;IPTV, Set Top Box, Content, Copyright Management, Internet, Public IP Address
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