Information code including redundant information providing copy protection
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United States of America Patent
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Oct 13, 2009
Grant Date -
Aug 11, 2005
app pub date -
Oct 31, 2003
filing date -
Dec 23, 2002
priority date (Note) -
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Abstract
In an information code which is arranged to redundantly code at least one first information element by means of a first information element, one or more of the marks can be omitted for the coding of at least one additional information element. In addition, copy protection can be created for an information code that codes at least one first information element by means of a plurality of marks by the addition of at least one interference mark whose optical characteristics differ from those of the marks in the information code. After copying, all the marks will have the same optical characteristics.
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