Script or Desktop App - Change Text in PDF files(repost)

I need a script or desktop application that will be able to duplicate a large PDF file, while at the same time change a line of text that appear on multiple pages of the file. For example, the file may have 80 pages, but I would like to run a script that can in the header and footer (always the same in the main file) and change it with a different line of text. A new PDF file with the new text will be created and put into a new directory. I hope this type of thing is possible, because doing this manually in acrobat and printing new files to PDF will be very time consuming. If you have any questions, please let me know. This is a sample. The PDF file is at: [login to view URL] The text I would need changed would be on different pages. In the above PDF example, you will notice the phrase "From the Library of Josh Goss". That occurs on the first page (the score) and then the first page of each musical part. So again on page 14, 17, 18, 19, etc. Wherever that phrase occurs would need to be changed to a new phrase and then a new PDF would then be created with the new text. I would then probably have a footer as well, and that would need to be changed for each new PDF created as well. The music would stay exactly the same, but the header and footers would need to be changeable. Let me know if you have any specific questions.