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Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!psuvax1!uwm.edu!spool.mu.edu!olivea!uunet!interet!iris
From: iris@interet.UUCP (User)
Newsgroups: comp.unix.programmer,comp.lang.c
Subject: Re: methods for putting labels into your software?
Message-ID: <25@interet.UUCP>
Date: 27 Jun 91 14:25:02 GMT
References: <1991Jun26.165609.9692@athena.mit.edu>
Reply-To: iris@interet.UUCP (User)
Distribution: usa
Organization: Interet, Maplewood, NJ
Lines: 40

In article <1991Jun26.165609.9692@athena.mit.edu> mlevin@jade.tufts.edu writes:
>
>   I'd like to hear suggestions, or any tricks that the pros out there
>know about, for putting some kind of text label or code into your
>executable (compiled and linked from C code) so that if anyone were to
>copy a part of the code, you could know it was a copy by somehow
>seeking out that label. 

For obvious reasons, I won't tell you EXACTLY what we do but it amounts
to something like this:

static short copyright_stamp[] =

CONSTANT1,    /* a few starting fixed bytes to search for */
CONSTANT2,
CONSTANT3,
CONSTANT4,
'T' * CONSTANT5,
'h' * CONSTANT6,
'i' * CONSTANT7,
's' * CONSTANT8,
' ' * CONSTANT9,
'i' * CONSTANT11,
's' * CONSTANT12,
' ' * CONSTANT13,
'm' * CONSTANT14,
'i' * CONSTANT15,
'n' * CONSTANT16,
'e' * CONSTANT17,
'!' * CONSTANT18,
0;

Make sure whatever operation you perform on the individual characters
is reversible.  
==========================================================================
Iris Engelson                          uunet!iris@interet
Director of Software Development       Tel: 201-763-1200
Interet                                Fax: 201-763-5120
111 Dunnell Road                       
Maplewood, NJ 07040