Is iText 5.4.2 open source?

Question

I would like to know whether iText 5.4.2 is a open source. I know it is described here well:

http://itextpdf.com/terms-of-use/index.php

But I am confused as the

Answer 1

The short answer is, yes, iText is open source. The long answer is the next paragraph.

The Affero GPL provides some restrictions, which they would be happy to remove, if you buy a license. For example, you must disclose your source code for apps based on iText, but if you do not want to do that, you can buy a commercial license, freeing you from the AGPL.