Wiley, D. (2016). An Open Education Reader. EdTech Books. https://edtechbooks.org/openedreader
Explore the website at https://edtechbooks.org/-eABG
GPL or GNU General Public License was the first copyleft license, and is still the most broadly used.
This content is provided to you freely by EdTech Books.
Access it online or download it at https://edtechbooks.org/openedreader/open-software-licenses-gnu-general-public-license.