Resource/book on legal aspects of production?

For example: When shooting video at a convention on behaf of a news/entertainment show would a videoographer need signed releases of every person who speaks on camera? Would the person need a release from the company who's booth your are video taping?

I am looking for a website or a book that explains in what situations you would need a signed release as well as other legal situations.

I have performed a search and did not find exactly what I am looking for. I have found books with one or 2 pages of basic info but nothing detailed.

Any leads? thanks
 
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