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nMethods for identifying equipment used in counterfeitingUS6788821 *Jun 13, 2001Sep 7, 2004Matsushita Electric Industrial Co., Ltd.Digital information embedding/extracting apparatus and method, and medium including a program for executing the method recorded thereonUS6823074 *Aug 4, 2000Nov 23, 2004Pioneer CorporationDigital-watermark superposing apparatus and digital-watermarker detecting apparat
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