How did they get the video? Do they make clear that it was your video? Defamation is difficult for a few reasons and if you want to reach someone more familiar with it, try asking in business litigation.
It might be more effective to go after them for copyright infringement. If the video is your work, you have a right to register it, and you have a right to control its dissemination. Copyrights are nice in that, if you file an application to register within 3 months of creating the video, you can collect statutory damages that range from $750 to $250,000 per offense. That is the sort of hammer that encourages folks to act quickly.
Answered on Dec 13th, 2013 at 9:01 AM