Well Hobble,
you have a couple of options.
BUT first, have you copywrited the script? If you have then you are protected and IF someone steals the script and If, great BIG IF
any money is made from it you have proof of ownership.
Point one.
See the thing is, studios don't steal scripts, and they don't really steal ideas either, not intentionally. Every concept there ever was is all ready out there. There are big time writers, studio heads, actors, and grips who are tossing out concepts all the time and getting the writing jobs for them.
How an idea, which you CAN'T copywrite gets "stolen" is ; you manage to get in and pitch your idea. The stuido guy/gal doesn't go for it, doesn't like YOUR execution, your version. They reject you.
Then, a month later, they sit bolt up right in bed "I GOT IT!" They move on "your" concept BUT they take it a whole new direction. Different plot, different story beats, different characters, maybe with a few things that are similar to your ideas. You see a trailer for it two years later and scream "They stole my script!!!!"
No, they didn't.
D is right. There isn't a concept out there that is SOOOOO cool, SO new, SO fresh that several individuals couldn't come up with it as well.
Point 2.
Someone on a message board who steals your script or your idea won't have the skills to take it ANYWHERE. If they HAD the skills and the talent to do something with your idea they WOULDN'T have to steal. It's not that we are an honest bunch, it's just that people who actually sell scripts are so busy with thier own kicking ideas and rocking scripts they don't have time to dink around with your (no personal insult intended) troubled script. And they don't have time to mess with a court case and the damage to their rep if you were able to sue them.
It's all about the money.
You aren't really concerned about protecting the idea, you are concerned about it's potential to earn cold, hard, cash. In order for it to do that the writing has to be spectacular. You have to make a script get up and tap dance.
That is where your copywrite comes in and keeping your notes and drafts. If your script gets stolen, gets made, then you have proof of the work you've put in. Not fun by any means but you can win.
Now to your options. You have three.
You can post five to ten pages in a forum.
Go ahead, read through the posts for a few days, get a sense for us. Go with your gut.
Posting five or ten pages will not jepordize your script. It won't even give away your big concept. It WILL give us an idea of your understanding of screenwriting principals and your writing level.
If you don't want to post the concept then don't. Just post the writing and let us deal with the basic tools of the trade.
I've been on the boards for six years, I've only heard of one script being "stolen." The moron just copied it from the boards and started posting it as their own. Didn't even change the title or anything. The owner found it, stated their side, others recognized the script and the theif was not only banned but totally humiliated.
You can post it on Zoetrope.
There you would place the entire script. More risky.
You have no idea who will review your script. You will likely get a bunch of hacks, you may catch a few serious writers. It's a total crapshoot.
You can pay someone.
There are plenty of people who read scripts for a fee and offer various types of servives.
I offer feedback and edits for 45.00 dollars.
Exthollywoodday over at DoneDeal critiques for 150.
I believe Ravenlocks will read scripts for hire, and there are a few more.
Post a message asking about readers/editors/critiques for a fee and you'll get some hits.
Or you could just send off the script and hope you get lucky.
The odds are stacked against you though. Really stacked.
The best thing is to learn how to have your script match your kicking idea so that BOTH move forward together.