Confusion about CKEditor commercial license and MODx

Hi, maybe someone can clear this out.
On the one hand CKEditor says it is free if you integrate it inside another Open Source software.
We'll since MODx is Open Source we should be ok to integrate CKEditor inside MODx as a plugin. On the other hand CKEditor says that you have to buy a commercial license if CKEditor is going to be used inside the pages of your website. Since this is also true do you see the confusion here ? What is the correct interpretation of these 2 conditions ?
http://ckeditor.com/license
Greetings Brian. [ed. note: sitecms last edited this post 14 years, 3 months ago.]

That is if you are selling a closed, proprietary application commercially and want to use CKEditor as part of your commercial product.

MODx is never a closed, commercial product. You can build proprietary sites with it, and attach commercial web applications to it, but MODx itself cannot be made proprietary or closed-source. If you're using MODx, the MODx part is GPL. This means that your client (the one you distributed it to) can do whatever he wants with the MODx code. So using CKEditor as part of MODx is fine. Using it as part of your attached commercial closed application is not.

It all has to do with distribution. What can your client, the one you distributed it to, do with the code? GPL means he can do whatever he wants (within certain limits; he can't say it's his own work, for example) with the code, with the caveat that whoever he distributes it to has the same rights to the code.

Ok, this made it clear for me and I gues not only for me. Ckeditor is a good choice for having a second editor to offer for your websites when someone isn't happy with tinymce. Thanks for the reply.