As for the PDF file from ASQ we purchased, technically it is not legal. The copyright notice states: "...No part of this publication may be reproduced in any form, including an electronic retrieval system, without prior written permission of ASQ..." I probably just violated the copyright by typing that.
I never bother controlling the ISO standard itself. If someone wants a copy they can have it. My systems rely on using the procedures, work instructions, etc. Nowhere is anyone ever referred to the ISO standard, so I don't see a need to keep it controlled.
I don't think you are going to have any issues if you put a PDF on a network to share in your company. If you start posting free copies on line or selling it, then you may have problems.
Tom