WebSpellChecker (WSC) is an integrated spell-checker of CKEditor starting from version 3.0. A free version with an advertisement banner is available for all CKEditor customers for free. If a customer wants to remove the banner, the Hosted or Licensed version of WSC should be purchased.
The WSC plug-in for CKEditor is a zero-installation solution for spell-checking provided by WebSpellChecker.net. You will now have a wonderful spell-checker running out of the box, requiring no server-side installations. Follow the instructions to migrate from the free version to the Hosted paid version of the plugin without the banner.
If you want WebSpellChecker engine to run on your server, then the Licensed Version is for you. Follow the instructions to migrate from the free version to the Licensed version of the plug-in.