JavaScriptSpellCheck is Commercial Software.
The Free version of the software works and does not expire - but displays an occasional message to remind you that the software is not licensed.
You may use the Free trial for your own development purposes which are non-commercial and non public.
If you wish to use the JavaScript SpellCheck software in a commercial or public setting such as an intranet or website - you need to register for a license key.
Is JavaScriptSpellCheck Open Source?
Certain components of the source are left in an easy to understand and modify format - but they remain copyrighted.