iText is a PDF library. It is widely used.
Version 1.1 adds significantly XFDF merges, 1.5 compression, more font subsets, better scripting support and signed/verified documents.
Apparently it is much better at recovering damaged PDF files now.
This is a POTB (Plain Old Techie Blog). You are likely to come across references to Open Source software, Java, J2EE and various internet topics like security and search engines. Be Seeing You.