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Software Vault: The Gold Collection
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Software Vault - The Gold Collection (American Databankers) (1993).ISO
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PK-CHT.DOC
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1993-06-03
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How to compress files with the shareware version of Pklite (tm)
so that they cannot be expanded, hindering reverse engineering
of your programs!
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Brought to you with the complements of Robber Soul!
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O.K, a little background:
As your probably know, Pklite is a package that compress .COM and .EXE files.
This have 2 main features:
A) It saves space (and that is the MAIN purpose for this program.)
B) A file compressed with Pklite can't be reengineered!
That is, you can't disassemble it, or edit it with a hext editor!
Where's the catch?
--------------------
The catch is, that for the second purpose, you need to...Yes, REGISTER..
For the small but painfull amount of 146 U.S dollars..
The shareware version of Pklite can be found on almost ANY BBS you know..
So it is very helpfull with compressing files..BUT, if you need more than that,
Things are getting complicated...
What can you do about it?
--------------------------
A) You can pay..
B) BUT, if you DON'T want to pay, continue reading...
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HOW NOT TO PAY AND STILL GET A "BULLET PROOF" PROGRAM:
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Well, you see, it is all VERY simple..
When Pklite compress your program, it adds some code at the beginning of
the file.
Among all the ascii codes, you will find a message (depends on what version you
have) that say something like "Pklite (c) Copyright 1990-1992" Etc.
On Pklite version 1.14 The message is
"PKLITE Copr. 1990-92 PKWARE Inc. All Rights Reserved"
I didn't check it on other versions of Pklite, so the message probably
changes. It doesn't really matter what the message is.
Now, enter the file with your favourite hex editor (Preferably Norton), look
for the string at the beginning of the file, and write random ASCII charecters
over it.
This simple effort will result it 3 ways:
A) CHK4LITE will report that the file was never compressed with pklite.
B) You won't be able to compress the file with Pklite (it's already compressed)
C) You won't be able to use Pklite with the -X switch, to restore it to normal.
This is EXACTLY what Pklite Proffesional is for, but this way, you can save
about $146 U.S ...
O.K, that's all there is to know.. Now go and write your programs,
and protect them with Pklite!
And remeber ROBBER SOUL!
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(C) 1992 Z-Force. All rights lost!
Robber Soul, 1992.