Welcome to pdf-vole an application to inspect the internals of PDF files. It will help you to understand the intenas of PDF files and can be used to debug problem files.
This project is based on one of the last version of itext before it changed it's license to GPL. You can try the application via webstart from here: Webstart version or go to the download section and fetch the application or sources from there.
The project is BSD licensed and can be used for personal or commercial use.
If you have questions or comments feel free to contact me. Input is always welcome