I own several copyrights, but I can tell you, copyright is as copyright does, in other words to quote from the movie "Forest Gump" Stupid is as stupid does, copyright is in fact a very enforceable thing, but is a very expensive thing to do, normally the person who hits the shutter buttom, either on the camera or the video camera "owns" the copyright, the key is, do they have the funds to enforce that copyright? In this day and age, you will find that most copyright issues will at least go to a district court, if not a Federal court, where we need to really look at...do you have the funds to prove your point? and are you willing to take the time to fight the good fight...most of the time, though there is a concent law that comes into place if your an employee of another company, that can be argued, that when a person, works for another company that anything they do while working, belongs to the company they work for, confusing, and a very grey area in US law.
Dave