Earlier quoted context omitted.
So you write a letter and dont want it published by the recipient, you need to file? Or all software written in a company, file? What about confidential stuff, file?
Abolition of intellectual property does not mean abolition of privacy; original author will still have the right of initial publication, but once published, no privacy assumptions and no recirculation restrictions unless registered.
Under which law is the privacy of a private letter enforced?