Building Games with DragonRuby falls under two licenses for different content within it.
First off, the code snippets. The code examples and sample projects contained in this book are licensed under The Unlicense. You can do whatever you want with the game code from the book.
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law.
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 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.
For more information, please refer to http://unlicense.org/
The actual text of the book where the code is described falls under a different license:
Building Games with DragonRuby by Brett Chalupa is licensed under Attribution-NonCommercial-ShareAlike 4.0 International
Examples of what you can do with the book under this license as long as it maintains the same license and gives proper credit:
- Translate it
- Reformat it
- Export it for a given format
What you can't do:
- Sell it
- Remove the attribution
- Share under a different license