问题
I plan to use CKEditor in commercial site. I've read http://ckeditor.com/license but I didn't understand how it is possible to have pricing for commercial use while they offer LGPL(which is good choice for commercial use)
回答1:
Imagine you want to compile the javascript code of CkEditor into a binary application. Just assume this is possible. Then you would not ship the source code of the library any longer.
If you now even make modifications to the source code to distribute within the binary, you do not satisfy the LGPL as it requires that you provide the source for the library along with your binary. Same for the MPL.
If you don't want to distribute (your changes in) the source-code form of the library, you then can get a commercial license by the project (you buyout the license).
Next to such specific cases I can imagine that some folks just would like to have a commercial license as form of a backup if their legal department is too much puzzled. If the license is relatively cheap, they can opt for it and continue with their own work w/o being further interrupted. Business, you need to keep it running.
But regarding the LGPL, as long as you offer source (incl. the changes you probably make) of the library, you're fine to use it with non-free programs. So this does not mean that your website must be LGPL it's just using a LGPL'ed library.
回答2:
You can use it for your commercial website. However, if you build a product and want to include (distribute) CKEditor with it then you might need a commercial license.
The condition whether you need the license is based on your product's license. If your product is closed sourced then including an open source product with it without sharing the source code is illegal. So, this commercial/closed distribution license fills the gap. You pay for it and you can distribute your product with the CKEditor closed sourced. Additionally you may do any closed source modifications to CKEditor.
TL;DR: if you want to modify and distribute it with a commercial license then you need to pay, otherwise you are free to use to for free!
来源：https://stackoverflow.com/questions/6305276/is-it-possible-to-use-ckeditor-in-commercial-web-site