Do I have to pay for CKEditor?

Question

Law in IT

I'm making a "social" site with a minimum income PHP/HTML , I want to install CKEditor on the site and sell it to the customer. Can someone clearly say I have to pay to use CKEditor if the site is for sale?
ps Need a free editor with the addition of pictures and tables. If you have to pay more for the editor the project will be stopped.
https://ckeditor.com/ckeditor-4/download/

Answer 1

IANAL, TINLA.
CKEditor is free software, which means that once you receive a copy of it, you have full royalty-free right to use it for any purpose, modify it, redistribute it unchanged or modified, with or without payment.
That is, no.