License information is inside NOTICE.txt and other LICENSE.*.txt files SDL2 and zlib are under the zlib license. png is under its own license. This code is under the Apache 2.0 license.
To get this code up and running you'll need the zlib, libpng, SDL2 and SDL2_image libraries available. TODO: add links to each Fetch these or their binaries. I've incorporated them here.
If you're in windows using visual studios, you can stick them in the Debug folder of your project. Future versions of this project may find an alternative method to make that happen more automatically.
/*Copyright 2017 Shaun Ramsey
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http ://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */