초록 ▼

Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is

Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The watermark is detected after the first emission decay time, but before the second emission decay time. The watermark is fragile under steady-state UV illumination since the inverted watermark component cancels the non-inverted component.

대표청구항 ▼

Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is

Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The watermark is detected after the first emission decay time, but before the second emission decay time. The watermark is fragile under steady-state UV illumination since the inverted watermark component cancels the non-inverted component. ssor coupled to said receiver for identifying an attempt by the calling party to initiate a connection to establish the communication link and terminating an attempt to establish the communication link by the calling party; a dialer coupled to the processor for automatically calling the calling party to establish the communication link with the calling party in response to the calling party's earlier attempt to establish the communication link. 16. The apparatus of claim 15 wherein said processor further initiates a disconnect message to terminate the attempt to establish the communication link. 17. The apparatus of claim 16 comprises a router. 18. The apparatus of claim 16 comprises a router which is utilized to couple a computer user to an Internet Service Provider. 19. The apparatus of claim 16 wherein the ISDN ope