From:	James MacDonald <trill AT Xnetbook DOT demon DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Licence management under DJGPP?
Date:	Thu, 17 Jul 1997 21:54:24 +0100
Organization:	Trills and Technologies
Distribution:	world
Message-ID:	<QSOGAFAAaozzEwv2@netbook.demon.co.uk>
NNTP-Posting-Host:	netbook.demon.co.uk
MIME-Version:	1.0
Lines:	23
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I want to distribute my program as a full and an evaluation version.
Both would be the same EXE file, the same size, but one would be stamped
with a registration code and one would not.

Perhaps the evaluation one would have REGREGREGREGREGEREG in it as a
placeholder for a code to turn it into a full one.

I'd like some help on how to replace text in EXE files so that they run
again, to display a user name.

The file, XYZ.EXE would be licenced by LICENCE.EXE - it would ask for a
name, and then a crypt()'d version of that name chosen with a special
salt (obviously crypt() would be doctored so that UNIX users couldn't
generate codes) - then the crypt'd string would replace REG.. in the
program. Possible, or not?

Executor does it :)
-- 
Revised anti-spam in use : remove X to reply - 
'Xnetbook' becomes 'netbook'

Anti-spam thermonuclear warheads cheap at only $300!

- Raw text -