Palin is supposed to give a speech in a public university in June. The details of the contract itself were made public because of some 'destruction negligence' by the organizers so that opponents could find and publish the document.
"The students who found the contract document said they acted on a tip that documents were being shredded at the campus administration building on a day when staff members were supposed to be on furlough.
Alicia Lewis, 26, was one of the students who went to investigate. The building was locked and gated, but the students were able to retrieve piles of paperwork, including the contract document, from a nearby trash bin, Lewis said. source
I prefer confetti machines and for the totally paranoïd I have seen some in which the confetti arrives in a big ball that makes it nearly impossible to find which confetti's to use to make which document. Especially if you add some normal papers with much text.