My Android phone prevents me from recording phone calls at the request of my carrier, even though it's totally legal for me to do so in my jurisdiction.
I'm not loving where this is all going.
The most frustrating part about this "feature" is that you don't know it's enabled until the screenshot is taken and you're left with a picture of nothing.
That and some app authors thinking they're protecting you with this (referring to banking apps in particular)
It is fine for historical documents, but doing today means you really want to piss people off. And by the way, PDF files support signatures, both handwritten and digital. There are ways other than printing a 100+ page document and scanning it just so that your signature shows up on a single one of these pages.