Interesting - I'm sure that any legalese can be argued several different ways. Here is what I found:
Right at the beginning of the Software Licensing Agreement for El Capitan:
1. General.
A. The Apple software (including Boot ROM code), any third party software, documentation,
interfaces, content, fonts and any data accompanying this License whether preinstalled on Apple-
branded hardware, on disk, in read only memory, on any other media or in any other form
(collectively the “Apple Software”) are licensed, not sold, to you by Apple Inc. (“Apple”) for use
only under the terms of this License. Apple and/or Apple’s licensors retain ownership of the Apple
Software itself and reserve all rights not expressly granted to you. You agree that the terms of this
License will apply to any Apple-branded application software product that may be preinstalled on
your Apple-branded hardware, unless such product is accompanied by a separate license, in which
case you agree that the terms of that license will govern your use of that product.
and:
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 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. For example, these single-copy license terms apply to you if you obtained the Apple Software preinstalled on Apple-branded hardware.
B. Mac App Store License.
If you obtained a license for the Apple Software from the Mac App Store, then subject to the terms and conditions of this License and as permitted by the Mac App Store Usage Rules set forth in the App Store Terms and Conditions (
http://www.apple.com/legal/internet-services/itunes/ww/) (“Usage Rules”), you are granted a limited, non-transferable, non-
exclusive license:
i) to download, install, use and run for personal, non-commercial use, one (1) copy of the Apple Software directly on each Apple-branded computer running OS X Yosemite, OS X Mavericks, OS X Mountain Lion, OS X Lion or OS X Snow Leopard (“Mac Computer”) that you own or control;
(ii) If you are a commercial enterprise or educational institution, to download, install, use and run one (1) copy of the Apple Software for use either: (a) by a single individual on each of the Mac Computer(s) that you own or control, or (b) by multiple individuals on a single shared Mac Computer that you own or control. For example, a single employee may use the Apple Software on both the employee’s desktop Mac Computer and laptop Mac Computer, or multiple students may serially use the Apple Software on a single Mac Computer located at a resource center or library; and
(iii) to install, use and run up to two (2) additional copies or instances of the Apple Software within virtual operating system environments on each Mac Computer you own or control that is already running the Apple Software, for purposes of: (a) software development; (b) testing during software development; (c) using OS X Server; or (d) personal, non-commercial use.
My personal interpretation would be: since Apple treats fonts as part of the OS and the OS is only licensed to you, my answer would be: No, you cannot. However, to be sure, I would contact their legal team (use the contact us link at the bottom of every page) to get a definitive answer. In cases like this, I would not simply trust any other user's interpretation.
