Copyright

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https://screencraft.org/2016/09/22/on-copyright-and-nondisclosure-agreements/?fbclid=IwAR1C9d3NrcJFXu3vixq2FF9U3rPks8OOvUg5FO3os1xvvLPHnglEFMDcnEg was written 22sep16 i  added 9mar19  The Writers Guild of America (WGA) offers script and other writing registration. It is available to both members and non-members. WGA charges $20 (discounted to $10 for members) and gives you ZERO copyright protection. This article says use https://www.copyright.gov/registration/   

https://www.scriptreaderpro.com/how-to-copyright-a-script-and-four-other-legal-pitfalls-to-avoid/   i added on 29 april 2019 

https://nofilmschool.com/how-to-copyright-your-screenplay  i added on 28may19

https://www.writersstore.com/wgaw-registration-vs-copyright-registration/  i added 1may 2020 says that WGA registration is pretty useless as its not Copyrighting your work . 

http://www.writeprotect.co.uk/  i added 12oct 2020 it claims you can upload your script to them ( who are they ? ) i found it via UK Screenwriters FB group . 

https://bectu.org.uk/   i added 12oct 2020 they do a script registration service for members someone says ,  i found it via UK Screenwriters FB group . At first glance i cant see a mention of this service on that site. Its a Union .