Yes this is doable if both app have  the same userId

You can implement a remote service in the unlocker paid app that check the 
license.
Then your free app invoke binds to that remote service to do the check.

If both of your apps share the same android:sharedUserId  you're not forced 
to make the service public.
If you don't have already have set a android:sharedUserId don't change it 
afterwards or it will cause problems (file permissions).

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