It's a closed educational session, the video is not the focus, the advertising doesn't highlight that the presentation includes screening the program, and you have evidence that you thought about the fair use and attempted to purchase a copy... I would just use the video.
Hypothetically, of course ;-) ~Barb
VIDEOLIB is intended to encourage the broad and lively discussion of issues relating to the selection, evaluation, acquisition,bibliographic control, preservation, and use of current and evolving video formats in libraries and related institutions. It is hoped that the list will serve as an effective working tool for video librarians, as well as a channel of communication between libraries,educational institutions, and video producers and distributors.