SOFTWARE COPY PROTECTION BY CONTROLLED UNRELIABILITY.

C. A. Gaston

Research output: Contribution to journalArticle

Abstract

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 languageEnglish (US)
Pages (from-to)4791
Number of pages1
JournalIBM Tech Disclosure Bull
Volume27
Issue number8
StatePublished - Jan 1985

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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