Unauthorized copying of software programs on a magnetic disk is prevented by deliberately creating on the disk a data area which cannot be reliably read. Multiple attempts to read the data area will not produce identical results. A routine is embedded within the software which performs multiple reads on the data area every time a program is loaded from the disk. If multiple reads on the data area produce identical results, then this is an indication that the disk being read is a copy and not the original disk.
|Original language||English (US)|
|Number of pages||1|
|Journal||IBM Tech Disclosure Bull|
|State||Published - Jan 1985|
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