When you do buy an individual copy, it comes with your name printed in the footer of every page. I had a copy of one once (won't say which one) and I could not let my boss read it. For many topics, national standards (like NIST) are great. They are free too.

Edit: We went with individual purchases because the group license was way too expensive. Had we paid for that, then we could have shared the docs with upto X employees.