Video created by Abbey Elder (Iowa State University) and is licensed by CC BY 4.0
Using the advanced search tool(s) provided by certain search engines like Google and Bing allow you to specifically search within different levels of usage rights and copyright. Tools like these may make the searching easier but the guarantee of quality OER still needs to be closely examined by your chosen standards.
An additional search tool is the George Mason University's Mason OER Metafinder (MOM) and SUNY's OASIS.
OER are largely licensed under a Creative Commons License and depending on the type of license the OER' s usage is effected.
Listed below are the types of Creative Commons Licenses with links to summaries of the usage rights.
The free availability of OER is a major selling point for the inclusion of OER for students and faculty alike, but simply because a resource is listed as an OER does not mean it is a quality resource. Much like any other course material the quality needs to be determined before use and due to the fundamental nature of the objects there is no universal standard to evaluate OER. Ultimately, the decision is yours as the instructor.
Below I have included links to some OER evaluating standards and criteria that may be helpful.