Internet archive has both moving images and stills including publicdomain; others are licensed under creative commons (CC).http://www.internetarchive.organd here are the various searches by CC license type:http://is.gd/dMHClAlso searching flickr by CC licensehttp://www.flickr.com/search/advanced/?flickr does have some very short film clips.I'm sure there are other tools, even the creativecommons website hassearching functionality.Youtube allows searching by license, too.Also, fair use may come into play depending on what the footage is to beused for.