US PATENT SUBCLASS 360 / 60
.~ Recording-or erasing-prevention

Current as of: June, 1999
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360 /   HD   DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL

55  DF  GENERAL RECORDING OR REPRODUCING {8}
60.~ Recording-or erasing-prevention

DEFINITION

Classification: 360/60

(under subclass 55) Subject matter including sensing or indicating the existence of an earlier recording on a record carrier and preventing erasure or double exposure of the

carrier.

SEE OR SEARCH CLASS

380, Cryptography,

4, for modifying a recorded signal to prevent rerecording.