저작권 보호를 위한 트랜스코딩 시스템에서의 워터마크와 암호화 및 PMP 구현

Abstract

As streaming services such as IPTV and VOD, charged cable TV broadcasting channels, charged satellite broadcasting channels and so on have increased lately and UCC sites have been developed, a number of video contents are being uploaded on the internet now. In addition, recorded contents of DMB which get started on servicing recently are being posted on the internet illegally. Thus, that contents are exposed to the danger of copyright violation mostly. In this paper, copyright protection system applying watermarking and encrypting while transcoding, and watermark and encryption system working in PMP are suggested and implemented for preventing such a damage. The suggested method includes transcoding the contents in PC, and applying a watermark in spartial domain of it, then encoding and encrypting it. As a result, unauthorized users can not see the contents normally even if they can get them, and although decrypted contents are distributed, the copyright can be confirmed using the watermark. Moreover, appying encryption when the contents of DMB in PMP are recorded can protect the contents from external export, and playing the contents more than fixed times is impossible by inserting the possible number of times of playing. By the experiment, it was confirmed that almost all watermark messages are detected, and unauthorized users without the encryption key can not see the contents properly. If the intensity of encryption become higher, playing the contents was possible, but recognizing it was not. Likewise, it was confirmed that if the encrypted contents implemented in PMP is played externally, playing was not possible, and when it is played above the fixed times, it can not be played at all. It was also confirmed that the time required for watermark and encryption is very short. The suggested contents in this paper will be used valuably for the area of streaming services such as IPTV and VOD, UCC sites, copyright protection in DMB broadcasting and so on.