Unless otherwise noted, Styrene is free software which is distributed under the terms of the GNU General Public License, version 3.0 or later. See the file named COPYING that you got with Styrene for the full legal terms and conditions. The exceptions to this rule are as follows.
The included source code for any executable code that Styrene generates, and any associated scripting, is hereby gifted into the public domain using a Creative Commons CC0 1.0 Public Domain Dedication. This covers all the extras that Styrene builds into your app bundle. In other words, this exception lets you distribute or use the bundle without any possible infingement against our licenses.
Bundles that Styrene generates do not include MSVCRT.DLL, but application code compiled with MinGW-w64 will try to use it. This is typically not an issue these days because Windows normally ships with a version of this DLL. You must examine your app’s license yourself carefully, and decide whether the MSVCRT library’s license allows you to use it with your code.
The CoC text carries a Creative Commons CC BY 4.0 license. It is not automatically included into bundles generated by Styrene.