Information recording medium capable of being tested for authenticity
AssigneeFujitsu Limited
InventorSeigo Kotani
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Abstract
The recording/reproducing apparatus of the invention can discriminate an illegally copied information recording medium by reading an irreversible area from the information recording medium on the basis of judgement on presence of irreversible data. The information recording medium of the invention includes a buffer area which is not affected by heat used in recording the irreversible data, and the judgement is obtained with the buffer area excluded. Therefore, a mistake in judging whether or not the irreversible data is recorded in the loaded information recording medium can be avoided.
Claims3
An information recording medium having a medium identification code for uniquely identifying a medium, comprising:
- a key recording area including a continuous arrangement of a plurality of rewritable and nonrewritable recording areas;
- said continuous arrangement of rewritable and nonrewritable recording areas including at least one buffer recording area formed immediately adjacent a trailing end of each of said nonrewritable recording areas.
Dependencies are inferred from the claim text.