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 last iText version released under a less restrictive license was iText 2.1.7 (java) and 4.1.6 (c#). It was both released under MPL / LGPL. Even though the authors removed it from the sourceforge page you are able to find it in many places in the web (e.g. maven central). Those versions are from 2009 and still do their job fine, if you need the latest pdf features however (newer versions of digital signatures, ...) or experience a bug you may have to use the latest version...

Update: There was an unofficial java version 4.2.0 but you have to build it for yourself.

Update II: There is a fork called 'OpenPDF' which continues based on that version. Today I would use that project.