Licence Key + Domain Name Combination
Restrict the use of the woocommerce-software-addon to check that a licence key is registered to a single domain.
This makes duplication of licence keys impossible, as the licence key is locked to one domain only.
A simple management screen in the should be provided, so Users can change the domain the key is associated with.
e.g. The User should be able to "de-register" a domain (if they were using it on a test environment), then can re-add the licence when they use the licence on the live site.