QUESTIONS ABOUT LICENSING ARE OFF-TOPIC. You may ask questions about open source licensing on https://opensource.stackexchange.com. This tag is for asking about designing programs that interact with open source software.
Open source software is software whose source code is published and made available to the public, enabling anyone to copy, modify and redistribute the source code without paying royalties or fees. Open source code evolves through community cooperation. These communities are composed of individual programmers as well as very large companies.
- see also: 'open-source' tag wiki - Stack Overflow