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Yes and yes.
It should be noted that you don't have to print the entire book or have an electronic device to show the PDF in order to bring what you need to a game day. I frequently print out one or two pages from my PDFs that apply to specific characters, and just bring those pages to game days, in case I forget my tablet or run out of battery charge. The watermark on each page proves that the printout is from a PDF that you purchased legally.