I can't speak for all the links but simply look at the link, does it link to a logical address like a studioname.com then you know it's the original script.
Exactly. And as if the choices he makes cinematically haven't all been done before. He and other directors with a style just do what they feel looks best. These easy to do comparisons don't mean anything as sometimes there are just a number of ways to film something. Just because someone did it before you in the 126 years we humans have been making movies, doesn't mean you weren't original when you decided to do something a certain way.