License key and trial period - library

[Joacim J]

Hi,

I have a RCP application that I want to release and the users may try it
for 30 days, after that the application will not execute until they buy
a license (=gets a license key).

Is there some good piece of software (lib) that can handle these issues?

BR
Jocke

 

[M van Leeuwen]

Well, you could try for example

http://freshmeat.net/projects/licensemanager
http://www.agilis-sw.com/ezlm/

But mostly the entrypoint to the licensemanager is vunerable.
With decompilers you can remove those calls from the software.
Obfuscators make it a lot harder, but not impossible.

I haven't seen any products inserting bytecode to prevent this
weakness. Please inform me if you do (pryxan at yahoo). I also
haven't any code which does not decompile or decompiles to
unreadable and unusable code.

Regards,
Michael.