Creative Commons licenses provide copyright holders a way to grant specific permissions for others to use their work, so long as certain conditions are met. There are 6 main licenses that vary based on whether others can create derivatives and use the work commercially. Open educational resources must allow free retention, revision, remixing, reuse, and redistribution of content to qualify as OER. Creative Commons licenses support these 5R activities to varying degrees, determining whether a work can truly be open.