This has been adapted from the full video of the speech, which comes courtesy of the Miller Center of the University of Virginia. The video, audio, and transcript versions of the speech can be viewed here at the Miller Center:
This clip is being posted here for use in a U.S. History lecture at Georgia Southern University. To the best of my knowledge, this should be in the public domain. If it is not, under 17 U.S.C. § 107, fair use protection is granted to works being used for nonprofit or educational purposes.