Actually, there are copyright provisions for “non-scripted audio visual works.”
NOTE:
The following is based on the Canadian Copyright Act. Although for the most part it is extremely similar to the U.S. Copyright Act (with bits and pieces similar to the UK one as well). With WTO treaties in effect, many of the laws are similar, so it can at least give you a general guideline to answer your question.
For the sake of the OP, let’s say it’s one of two possibilities:
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"Scripted" audio visual material (film, television show)
2)“Non-scripted” audio visual material (improvised works, home videos, news coverage)
For non-scripted works (prior to 1994), the owner of the copyright is the owner of the first medium of fixation – whoever taped it first.
Very Generally:
Where a production company hires and is the employer of a director and producer, the production company is the owner of the copyright of the audio-visual work.
So if the production company brings an audience together, and the situation is controlled by a producer, the production company holds control of the copyright of the “work.”
So think of a talk show where the audience participates in a non-scripted kind of way (like lots of audience participation) – the show the audience is attending is controlled by the production company (even though inidividual audience members do whatever the hell they please.)
If you bring in a video camera and start taping, you may be bootlegging. But as Handy says, if you have permission, you’re fine. For the most part, cameras and recording equipment of any kind is prohibited at any kind of live performance (whether it’s a play, talk show, musical performance or a lecture.)
Copyright laws do tend to get very messy though with non-scripted works when it comes to the issue of “authorship.”