As I was reflecting on the ballet performance, some of my own dance memories came to mind.  Having danced for the majority of my life, and competitively for seven or eight years, I remembered some issues of choreography.  In one instance a graduate of our company came back to teach a class.  He knew Michael Jackson and was in the midst of the audition process for the “This Is It” tour.  When he came to teach us, he decided he wanted to do an excerpt from one of the numbers that would be featured on the tour.  In class, many dancers liked to videotape themselves doing the choreography from that day and then post it on youtube or Facebook. Knowing this, the graduate told us we could record the choreography just not post it anywhere public because he did not own the rights to the choreography and could get in serious trouble.  Upon remembering this instance, I became interested in how one can copyright choreography. This link provides brief requirements.  I believe that this did not fall under fair use for two main reasons.  The first being that none of the choreography was changed when it was taught to us and the second being that the choreography was being taught to us in a commercial setting where we were essentially paying to learn the choreography through our paid dance lessons.