US PATENT DOCUMENTS 3,406,344 A 10/1968 Hopper 3,842,196 A 10/1974 Loughlin
3,885,217 A 5, 1975 Cintron 3,894,190 A 7, 1975 Gassmann 3,919,479 A 11/1975 Moon et …

Watermark data may be transported by preprocessing one or more elementary data streams.
Preprocessing may be achieved by demultiplexing the elementary data stream or by …

The present invention provides data steganographically embedded in multiple channels.
The term “channel'in this application is generally used to refer to a mechanism, material or …

6. 23 0. 269 B1 5, 2001 sea C. a. Ken; Internet Draft—Integrating Single-Use Authentication
Mecha 6,233.685 B1 5, 2001 SGA nisms with Kerberos; Nov. 18, 1998; Updates: RFC 1510; …

The disclosure describes methods for using digital water marking to authenticate digital
media signals, such as images, audio and video signals. It also describes techniques for …

US PATENT DOCUMENTS 3,947,825 A 3, 1976 Cassada 3,984,624 A 10/1976 Waggener
3,986,624 A 10/1976 Cates, Jr. et al. 4,038,596 A T. 1977 Lee 4,200,770 A 4, 1980 Hellman …

2008-11-05 Assigned to DIGIMARC CORPORATION (FORMERLY DMRC CORPORATION)
reassignment DIGIMARC CORPORATION (FORMERLY DMRC CORPORATION) …

Methods and devices are provided to thwart analysis of a watermarking system by
preventing analysis of watermarks in a host content. Upon receiving a content at a …

0003 2. Description of Related Art 0004. The protection of data is becoming an increasingly
important area of Security. In many situations, the authority to copy or otherwise proceSS …

There are many advantages to implementing a watermark based system using dedicated
hardware, rather than using software executing on a general purpose processor. These …