Stock Photography

I Started in Stock Photography mostly as a hobby right now. I am on a site called shutterpoint, and they require a model release for every photo of a person. I need to understand that for a celebrity, but not to take pictures of people on the street or people who are not recognizable - Other sites that restrictive? Do I really need a model output every time I take a picture of someone for the hardware? Thank you

You absolutely need a model release form for all.

Damn, I get the forms for my fiancee and her family.
Why? In the worst case, we're not together one day.
If I did not get the release forms, and he and his family now subject to be in my pictures, I can not use them.
If I release forms, hard biscuits.

Legally, if someone does not sign a form, they can change their mind at any time.
And you do not want to lose a piece, or gain of a trial.

You have much to lose.
Definitely make sure you get the release forms.
The habit.

Check out Bryan Peterson book "Beyond the portrait"
It is a stock photographer, and his book is a must if you start Stock Photography.
He wrote a chapter on the forms of model output, and very informative.

Yes you need a model release! Otherwise, they can sue you!

Yes. In fact, if a site allows you to use a photo of a person without a release, they are probably not particularly famous. People, even ordinary people have the right to protect the use of his image. This is essentially a news model will do.

take pictures for sale, is covered by strict laws to protect the photographer, the person using the photograph and the person photographed. Model Release forms have just covered with people looking for money, he sold a large photo, a model can sue for more money, or if the model is young form to prove you had permission to take the picture.
celebrity photos in public places are covered by other laws.

Require bet is to prove who owns the copyright, in part.
He also said that you have taken or even the photo. So if someone else can prove that someone posted a photo is theirs, then, is the person who posted the photo that is being sued for libel is not the site . someone please correct me on the law