Are all openly available resources considered OER?
No. The chief difference between open resources and OERs is that users have the ability to Retain, Reuse, Revise, Remix, and Redistribute (the 5R's) the content for educational purposes. Other free resources like Google Books or HathiTrust are open, but they cannot be remixed by a professor for the classroom. Many resources that are licensed or paid for by the Libraries are also less flexible than OERs and are considered paid resources. These do not qualify as OERs, but may still be useful in the classroom and are accessible at no additional cost to students.
Why are OER gaining popularity among students and faculty?