REGISTER WITH THE WRITER’S GUILD OF AMERICA (www.wga.org)
Aside from copyrighting your screenplay with the Library of Congress, it’s a good idea to register your script with the WGA, a guild designed solely for the purpose of helping screenwriters. You can utilize the script registration process even if you are not a guild member.
If you are a screenwriter and live east of the Mississippi register your material with the WGA East. If you are a screenwriter and live west of the Mississippi register your material with the WGA West. If you live on the Mississippi river… I don’t know what to tell you. But I’m sure you’ve got a great story to tell.
You can mail in a hardcopy of your screenplay or do the process online at the www.wga.org website. The cost is $20 for non-guild members and $10 for guild members in good standing. Script registration is valid for a term of five years.