WGA script registration service

The WGA script registration service is a service run by both the Writers Guild of America, East (WGAE) and the Writers Guild of America West (WGAW) to establish the date of creation of literary property, typically a motion picture screenplay, useful in the often-contentious US entertainment field. The service supports the WGA screenwriting credit system but is also available for non-members to use.

Source: Wikipedia — WGA script registration service (CC BY-SA 4.0)