What is your favorite pdf hack (not file-format based):
Change text?
Remove watermark?
Remove ads pictures on documents to print?

@Ange considering impact: select to unredact :)

@Ange Apparently removing restrictions on a PDF file (copy / print / view / modify) are all just flags that can be turned off. But Adobe will get “big mad” if you make a utility that does this.

Not encryption, obviously, but everything else.

@Ange browsing revision history

@buherator wdym?

@Ange removing the user restrictions password

@Ange you know when some smart bureaucrat draws black rectangles over paragraphs then someone on the Internet does a Ctrl+A Ctrl+C Ctrl+V and publishes the whole text layer

@sid77 @Ange I use pdftk and/or qpdf to do this.