Hi,

I'm working on a Java application which is doing some licence checks using a third part licence software (flexlm).

This provide secured licence files and a java API to check licence.
So, I added something like that in my code :
LicenceChecker.check("/opt/licence.dat");
and it throws a security exception if the licence is wrong.
This mechanism is working well.

But, nothing prevent a hacker to decompile the class which implementents this check, and use the application without the licence.
Is there some mechanisms available to protect agains that ?
I played a bit with jar signing, and integrity of class files is assured, but once again nothing prevent a hacker to decompile my jar file, replace the licence check class and recompile it and sign it with his own certificate.