There are a number of websites which have free, stock or public domain images and audio. Most of them ask only for attribution of photographer, performer or source- be sure to check the item for specific permissions.
Amanda Hardy
Text
Instructional
lecture capture, ELTAC, ELTAC SSBR, WBLT, copyright, images, audio, podcast
cc-by-nc-sa/2.0
http://creativecommons.org/licenses/by-nc-sa/2.0/uk/