>>itextsharp older versions can freely used in business applications.
>>
>>Do you know where I might find one of these older versions?
>
>itextSharp official SVN contains this branch. You can download it from SVN, they will not provide zip file for this. Also I can send source zip file to you,
>I downloaded it somewhere which I dont remember.

Yuo can download it probably here:

http://blog.bytescout.com/2011/04/net-bear-do-you-know-any-free-pdf.html

this contains changes in free version:
http://code.google.com/p/itextsharpmplmaint/