Da steht es

Aus dem Sierra-Lizenz-Gedöns:
»2. Permitted License Uses and Restrictions.
A. Preinstalled and Single-Copy Apple Software License. Subject to the terms and conditions of this License, unless you obtained the Apple Software from the Mac App Store, through an automatic
download or under a volume license, maintenance or other written agreement from Apple, you are granted a limited, non-exclusive license to install, use and run one (1) copy of the Apple Software on a single Apple-branded computer at any one time.«

In der Server-Variante heißt es zudem:
»D. Other Use Restrictions. The grants set forth in this License do not permit you to, and you agree not to, install, use or run the Apple Software on any non-Apple-branded computer, or to enable others to do so. Unless otherwise permitted by the terms of this License or as otherwise licensed by Apple: (i) only one user may use the Apple Software at a time, and (ii) you may not make the Apple Software available over a network where it could be run or used by multiple computers at the same time. You may not rent, lease, lend, sell, redistribute or sublicense the Apple Software or exploit any services provided by the Apple Software in any unauthorized way.«

Alles zu finden unter: https://www.apple.com/legal/sla/