License for a Web Site

Hi everybody.
In this time, I creating a web site for a french company. The source code shouldn't be published. So, I just want to know if I can use FCKEditor free and what are conditions for this ! I already read "License" page, but I am french and my english is not really good... so I am not really sure. I don't want to modify FCKEditor, just use it. I can publish under GPL License the code of FCKEditor, but not of my entire pages.

Thanks you.

Askara