OPTICAL DISC WITH A THEFT DETERRENT COATING
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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.
15 Citations
35 Claims
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1-18. -18. (canceled)
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19. An optical disc used for data storage comprising:
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a disc body having two opposed surfaces; a standard data storage area disposed on at least one of said surfaces and being readable by an optical data handling device; and an RFID associated with said body and having a first mode of operation and a second mode of operation, said RFID being responsive to a query only in said first mode of operation to generate an output signal, said RFID including an element responsive to an external signal to change the mode of operation of said RFID.
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- 21. The optical disc of claim 21 wherein said RFID is initially in said first mode, said RFID changing to said second mode in response to said external signal.
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26. An optical disc for storing digital content comprising:
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a hub with a lead-in area; a data storage area disposed around said lead in area and containing content; and an RFID that has a first mode of operation and a second mode of operation, said RFID generating an output signal only in said first mode of operation, said RFID including an element that sets said RFID to one of said first and second mode permanently, said element being made of a material that changes its characteristics when exposed to a predetermined radiation.
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- 28. The optical disc of claim 28 wherein said material changes its electrical characteristics.
- 32. The optical disc of claim 32 wherein said electronic circuit is a tank circuit formed of a capacitor and an inductor, said element being at least a part one of said capacitor and said inductor.
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33. A package comprising:
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an outer shell; a media storing content in a digital format; and a theft control element including an RFID device that operates in one of a first mode in which it generates an output signal in response to a query and a second mode in which the RFID is not generating said output signal, said RFID including an element that controls whether said RFID is in said first or second mode in response to an external signal.
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- 35. The package of claim 35 wherein said external signal changes an electrical characteristic of said element.
Specification