From the ETD Copyright FAQ, because dissertations are disseminated through ProQuest, permission must be obtained for copyrighted material. Here is the direct quote:
Permission must be obtained when using any of the following: maps, drawings, tables, figures, photographs, sound files, and video clips, among others.
On the ETD Copyright Page, you can find some sample letters to make your requests of the publishers. Most publishers will quickly (and freely) grant permission to use content in a thesis or dissertation. When you make your permissions requests, make sure you state clearly that your work will be disseminated through ProQuest, which is a commercial entity.
If you are interested in learning more about Fair Use, even if it does not apply for this particular case, you can find information and resources on our Copyright Guide's Fair Use section.
