how do I crop

I have a 720-page DRM-laced textbook I intend to emancipate. Well I printed it out to PDF but it tacked on a header of "PRINTED BY: My Name <myemail@address.com>. Printing is for personal, private use only. No part of this book may be reproduced or transmitted without publisher's prior permission. Violators will be prosecuted." - I don't really give a shit but I don't want my e-mail on something to spreading online.

What is some clever /prog/rider way you think I can crop that shit out in every single page? The current retard tier idea I have is recording a mouse macro of me cropping one page, and then printing that single page to pdf, and then repeating that for every page and then merging it all back together.

It would have been much easier to edit the PDF to remove all traces to your email. I'm pretty sure most PDF editors have some macro or regexp feature.