Info about it from the official site:
https://www.dronecode.org/news-faq/announcement/2014/10/linux-foundation-and-leading-technology-companies-launch-open-source

This is interesting to me because I am in the process of building my own quad drone from the ground up, using the T4-Quadcopter obtained from Thingyverse.com as my first multicopter.. I have just begun learning about Arducopter and software, and I have ordered most of the gear to build and operate the copter as a drone.

I am going into this blind, but I am figuring that since my son and I built our own 3D printer this year, this is a next logic step... Wish me luck.