I'm trying to automate the process of pasting a box over some existing text on a pdf. For each new pdf I would like to cover some text in a light gray box, so the end result is that the text is not shown. I want to be able to make a tool that will pull in 50 pdfs, have a gray box cover the text, and then have them saved. What I'm looking for is some direction on how I can automate the process. For example, are there some tutorials or methods you would suggest I look into?