Was MS-DOS code copied from CPM.pdf

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WAS MS-DOS CODE
COPIED FROM CP/M?
Bob Zeidman
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AGENDA
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History of DOS and CP/M
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Forensic Analysis of Software
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Comparison of DOS and CP/M Code
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Comparison of Command Line Interfaces
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Comparison of System Calls
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Conclusion
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What, if anything, was copied?
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Was there copyright infringement?
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Q&A
Was MS-DOS Code Copied from CP/M?
Aug 6, 2016
4 of 44
HISTORY OF DOS AND CP/M
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Kildall invented CP/M, the basis for the microcomputer OS
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That fateful day 36 years ago: August, 1980
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Gates sent IBM to DRI
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Kildall didn’t meet
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IBM went back to Gates
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Microsoft bought QDOS from Seattle Computer Products
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Microsoft hired Tim Paterson to modify it and create PC-DOS (MS-DOS)
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Seattle Computer Products profited
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Gary Kildall and DRI profited
Was MS-DOS Code Copied from CP/M?
Aug 6, 2016
5 of 44
BUT…
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Was DOS an illegitimate copy of CP/M?
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Was code copied?
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Were commands copied?
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Were system calls copied?
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Is there a secret command in CP/M and DOS that proves copying?
Was MS-DOS Code Copied from CP/M?
Aug 6, 2016
6 of 44
FORENSIC ANALYSIS OF SOFTWARE
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Scientific analysis
Quantifiable
Not determined by legal issues
Source code correlation
Six reasons for correlation
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Common algorithms
Commonly used identifier names
Common author
Third party code
Automatic code generation
Copying
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Iterative filtering
Was MS-DOS Code Copied from CP/M?
Aug 6, 2016

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