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if i buy the license and enter the activation code in the program, anybody can decompile the exe and read the license key. even if the code gets obfuscated, strings dont get obfuscated. how can i prevent that out of 1000 users one steals my registration code and uses the chilkat library with my license without my knowledge?


asked Aug 06 '13 at 11:00

sharkyenergy's gravatar image


You could store it encrypted in a table or ini file, and process it at runtime.


answered Aug 06 '13 at 15:17

cdlvj130's gravatar image


sounds good! any tipps or decent tutorial on how to do it? thanks!

(Aug 06 '13 at 15:28) sharkyenergy

I use the chilkat RSA module.

But you would have to have the RSA key in your program to unlock that component.

Another way is to define a string, and store the key backward, with every third character being the key.

key is IBM_FG,



make key 1 letter off JCN_GH


answered Aug 06 '13 at 16:15

cdlvj130's gravatar image


I chose to obfuscate the unlock codes in a similar fashion, but that still leaves a theoretical risk that someone manages to reverse engineer the logic to reconstruct the real unlock code. On the other hand it is not that critical if anyone would gain access to an unlock code. After all they can only use it to develop applications with Chilkat components and not gain access to any critical information.

(Aug 08 '13 at 04:37) roan98dk
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Asked: Aug 06 '13 at 11:00

Seen: 1,698 times

Last updated: Aug 08 '13 at 04:37

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