Hi,
Taken from iTextSharp github repository:
iTextSharp is licensed as AGPL software.
AGPL is a free / open source software license.
This doesn't mean the software is gratis!
Buying a license is mandatory as soon as you develop commercial activities distributing the iText software inside your product or deploying it on a network without disclosing the source code of your own applications under the AGPL license. These activities include:
- offering paid services to customers as an ASP
- serving PDFs on the fly in the cloud or in a web application
- shipping iText with a closed source product
Contact sales for more info: http://itextpdf.com/sales
Best
Stefan