Indelible watermark on optical discs
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United States of America Patent
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Issued Date -
Jun 27, 2002
app pub date -
Nov 28, 2001
filing date -
Dec 27, 2000
priority date (Note) -
Abandoned
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Abstract
Light-readable information-recording media are fabricated according to a method wherein the back of a production stamper is laser-scribed, diamond-scribed, etched, or marked by other means to produce an image. This production stamper is then used to form a substantially transparent substrate having information recorded on it by means of pits and lands. During the formation of the substrate, the image is transferred from the back of the stamper to the surface of the substrate. The resulting watermark may be visible under normal light conditions. Information-recording media bearing indelible watermarks according to the present invention are also disclosed.
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