Need a Java Tool to watermark PDF files when they are downloaded by users.
I think this should be a free tool that I can implement to watermark pdf files that users download.
I need to do the following:
1) Display a watermark on the first page of the document.
2) I will need to display a static message on the top and bottom of each page of the document.
3) I will need to display a date and time stamp on the top and bottom of each page of the document for indicating when the document was downloaded.