The symbol for the Creative Commons Attribution license Copyright is a difficult concept for a site like ZOMDir. Of course copyright is claimed for the server software. However to create a better internet, the content (the by the server delivered webpage) is copyleft.
To be more specific:
Licensees may copy, distribute, display and perform the work and make derivative works based on it only if they give the author or licensor the credits in the manner specified by these.
When you use parts of the work of ZOMDir please use the following code on that webpage:
<p>This webpage is based on <a href="https://www.zomdir.com/">ZOMDir.com</a></p>
When there is a specific webpage of ZOMDir used, please refer to that page.