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US 8,014,261 B2Granted
Optically-readable disk with copy protection device
OwnerGary Stephen Shusterinventor
Life of this patent
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Abstract
An optically-readable disk includes a device that disrupts readability of the disk when the disk is spun at an angular velocity substantially greater than required to play the disk in its intended playing device, or for when a defined integral of velocity and time is exceeded. The device may include a fluid container that disperses a data-disruptive fluid. The device may include a membrane or layer that is disrupted when the disk is rotated above a defined angular velocity, or when a defined integral of velocity and time is exceeded.
Claims8
An optically-readable disk comprising:
- a plurality of layers, including an optically-readable data layer having data encoded therein;
- a deformation layer disposed over the data layer, the deformable layer comprised of a material that does not interfere with reading of the data layer when the disk is spun at a first angular velocity suitable for playback, and that deforms so as to interfere with reading of the data layer when the disk is spun at a second angular velocity, substantially greater than the first angular velocity, wherein the deformation layer comprises a visco-elastic material having a shape memory property for returning to an original condition after deforming.
Dependencies are inferred from the claim text.