致谢

Optically 所使用的软件与美术素材

Sparkle

Optically 使用 Sparkle 检查并安装更新。 Sparkle 依据 MIT 许可证分发，按该许可证的要求，全文转载于下。

Copyright (c) 2006-2013 Andy Matuschak.
Copyright (c) 2009-2013 Elgato Systems GmbH.
Copyright (c) 2011-2014 Kornel Lesinski.
Copyright (c) 2015-2017 Mayur Pawashe.
Copyright (c) 2014 C.W. Betts.
Copyright (c) 2014 Petroules Corporation.
Copyright (c) 2014 Big Nerd Ranch.
All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

EXTERNAL LICENSES

bspatch.c and bsdiff.c, from bsdiff 4.3 <http://www.daemonology.net/bsdiff/>:
Copyright (c) 2003-2005 Colin Percival.

sais.c and sais.h, from sais-lite (2010/08/07) <https://sites.google.com/site/yuta256/sais>:
Copyright (c) 2008-2010 Yuta Mori.

美术素材

Optically 标识和应用图标是 Flash Media Solutions, Inc. 的原创作品，用 Adobe Illustrator 绘制。 它的每一种呈现形式——应用图标、菜单栏字形、本页顶部的标识——都由那一个源文件生成。

首页那张照片拍的是桌上的一台 Sonos Ray。 Sonos 硬件出现在那里属于常规的编辑性使用；本站和应用中的任何地方都未使用 Sonos 的美术素材、照片或文档。