Licensing Mechanism in java

[i ananthaprakash]

Hi All,

I have written a Standalone Java application which i will be giving it to my client.
Now the application is licensed and client should not miss use it.(Its a user based license i e for eg if i sell it to a X customer her can put it in all his pcs)
Initially i will be giving a 30 days trial pack later he needs to mandatoryly purchase the license file from me.(License file is a Serialized file)
I really stuck here on how to manage the license mechanism.
I am using the INNO SCRIPT for installer.

Please do give me your Valuable Suggestions.

Thanks in Advance.