I was just reading a question where an answer provided a link to a script of a two part episode of a television show. This is not hosted on a production company website, it's what appears to be a private site.
I am not aware of all the legal issues with scripts, but I know there are a number of companies in Hollywood that sell TV and film scripts to people. Sometimes the scripts are copies of early drafts, or of the actual shooting script, and sometimes it's the result of someone watching the movie or show and typing in, word for word, a script of what is seen on the screen.
I know the writer of a TV episode is allowed to sell physical copies of his/her script, but that the production itself is, of course, copyrighted by the production company. In general, a script up on the internet without the production company's approval is a copyright violation.
I know the issue of TV shows and movies on YouTube is a grey area, since YouTube pays licensing fees to corporations to allow copyrighted content, but most copies of TV shows and movies on YouTube are uploaded by individuals, often from DVDs where the licensing for the product states it cannot be redistributed in any way.
Should we allow links to copyrighted YouTube videos? (I think there's a difference between a link to a 3-4 minute scene in a movie or from a TV show and an entire movie or show. The first would be fair use, the second would depend on the licensing agreements for YouTube.)
And should we allow links to text that is a direct copy of copyrighted material?
I know this isn't popular, but laws vary from country to country and, honestly, with the nastiness that has been going on with copyright law in the past few years, I think we need a clear policy on this.