Who Can Use This Book

The author (David Billings) has licensed all his written books published here under Creative Commons license allowing for anyone to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material for any purpose, even commercially. Although the books is under creative commons license allowing remixing, sharing, and copying, however, the copy of the books stored and downloadable from the website is 100% edited and maintaned by the author (David Billings).

 Any errors should be reported for an update to be made to this book. For more licensing info please click on the CC (Creative Commons) link.

NOTE: Any material listed under additional documentation in not covered under the authors creative commons license and is downloadable and usable under the licensing info provided in such material.