[cybmole]

all protections can be broken! - but, having said that, PDF has pretty good security options - you'll need a paid-for package to set them up though. I'd expect apple to take care of security for you if you sell through their stores.

go to adobe web site for more info on PDF security.

I've bought PDF materials in the past where the author emails you a separate unlock password - that simple system predates ebook publishing but does not stop a password from being shared.

I am sure you realise that once you allow your materials to be printed then anyone with access to a photocopier or a modern day all-in-one printer/scanner/copier is good to go

When PDFs are sold like ebooks via ebook stores, then adobe have security which manages how many device the book can be installed to & to control what can be printed & how often...

I think rental controls also exist so that libraries can "lend" pdf in a managed way.

Is it practical to sit at a keyboard & play from a 7 inch tablet ? Maybe yes if you have good eyesight can can quickly reach out & swipe as needed to turn a "page", but I reckon my older eyes would need A4 pages...