How to implement LVL license in an icon pack?

Morning, guys!

I developed a theme pack that works with all launchers (except Launcher Pro) and it has been in Play Store for about 2-3 months.

It has also been cracked, so people downloaded on the net instead of buying it.

Now, on my new theme I'd like to implent the LVL license. I know that it's would still be cracked, but not all users know how to do it. I just want my theme to be a bit safer.

I tried ito implement it but it doesn't work.

Apex launcher's developer told me that it's possible to implement it in icon packs even if they don't have a UI.
Could someone help me doing that?

Thanks a million! :)

Regards


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