Creative Commons USA, the Rebus Community, and the Open Textbook Network (OTN) have worked together to create an Adaptable Open Educational Resources (OER) Publishing Agreement. This document is a starting point for higher education institutions that are looking to contract with their faculty to create OER. It was developed in a way that makes it easy for institutions to edit to meet their own campus intellectual property policy requirements.
Creative Commons search allows you to access images without restrictions (or it will tell you what you can or can't do with them). There is a filter here for Google Images set with the ability to search for images without copyright restrictions.