Open Textbooks are a particularly important Open Educational Resource that faculty and students are free to use or adapt! They have many advantages:
To locate Open Textbooks consult the library's Open Textbook Libguide.
In order to Modify an Open Textbook you can do one of a few things:
NEVER use content not licensed for open usage.
If you wish to be a real hero, create your own Open Textbook and release it for others to use; particularly if you have expertise that is needed or if you see Open Textbook content lacking in a discipline/topic area. To do this, follow step #5 in How to Modify an Open Textbook section above and then release the content under the appropriate Creative Commons License (Share or Share Alike - and skip the Non-Commercial if you want printers like Flat World of Knowledge involved).
Similarly, many Open Textbook sites are looking for people to either Peer Review an Open Textbook or do a post-publication review. To learn more about all the ways you can get involved with the Open Textbook movement, check out this resource from BC Campus