Optical disc with a theft deterrent coating

Details Optical disc with a theft deterrent coating Optical disc with a theft deterrent coating

2006-04-05

2008-08-26

Rutledge, Della J. (Department: 2851)

Photocopying

Projection printing and copying cameras

Illumination systems or details

C355S071000, C360S027000, C360S068000, C360S084000

Reexamination Certificate

active

07417713

ABSTRACT:
An optical disc used for storing content includes a theft control area selected to render the disc unreadable. The disc must be exposed to radiation of a specific wavelength before it can be read by a regular device. The theft control area may include an area that contains data that instructs the device not to read the disc. This area includes a coating that changes its optical characteristics when exposed to the radiation. The material could be radiochromic or thermochromic. Alternatively, the theft control area includes an RFID device that includes an element that is radiation sensitive. In this embodiment, when the disc is irradiated, the element changes its electrical characteristics.

REFERENCES:
patent: 2005/0083829 (2005-04-01), Selinfreund et al.
patent: 2007/0096915 (2007-05-01), Forster et al.

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