Open Pedagogy does have some elements of copyright to consider.
A couple of great resources:
A Guide to Making Open Textbooks with Students : A handbook for faculty interested in practicing open pedagogy by involving students in the making of open textbooks, ancillary materials, or other Open Educational Resources. This is a first edition, compiled by Rebus Community, and we welcome feedback and ideas to expand the text.
Most publish materials under a Creative Commons license.
A brief summary image is provided below but more can be found on the Creative Commons site.
JoKalliauer; foter, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0>, via Wikimedia Commons
Image above Created by Kennisland published under a CC0 license.
The chart above shows the compatibility of all licenses. All materials must be harmonious to be published together. This is particularly important for Share Alike license.