No matter how you do it, you are protected by copyright law, which says that the moment you complete a work, it is protected by international copyright law. The catch is WHEN. Any registration service or filing places a date/time stamp on the work, proving when it was created. The only advantage to a Library of Congress registration is that (to my knowledge) it's never been questioned in a court of law. Writers Guild registration is easier, faster and cheaper — and must be renewed periodically. In addition, there are registration services like:
Writers Guild of AmericaProtectRiteFilm TrackerWorldwide Online Creator's RegistryHollywood Script Readers DigestRights MarketplaceScreenplayersScreenwriters MarketScreenwriters UtopiaWriters Script NetworkIn order for copyright protection to be extended worldwide, use the following format:
[script]Copyright © YYYY Copyright Holder's Name, All Rights Reserved[/script]
Here's an example:
[script]Copyright © 2005 Donnelly R. Bledsoe, All Rights Reserved[/script]
In the United States, it is
NOT necessary to include the above notice in order to be afforded protection under the law. I do not recommend that it be placed on screenplays because it dates the screenplay, which could have an adverse effect should a producer read something in a few years that you created in recent years because it may be viewed as "old."