Shield
Licensing that cannot be patched out
Null-proof licensing for plugin authors. The paid code never ships inside the plugin — it is served, so there is nothing in the distributed file to crack.
Visit useshield.devPlugin licensing usually fails the same way: the check lives in the file you hand to the customer, so it can be found and removed. Shield takes the check out of the equation by never shipping the paid code in the first place.
Pro functionality is served rather than bundled, which means a cracked copy of the plugin has nothing valuable left inside it. Authors get licensing that holds up without shipping a puzzle for someone to solve.