What is the ‘low-income individual’s copyright’ and is it legitimate?

The “low-income individual’s copyright” is a concept that proposes sending a duplicate of your own creation to yourself through mail and maintaining it sealed, with the notion that the postmarked envelope provides evidence of the work’s origination and the date it was created. However, this approach is not an acknowledged or official means of copyright protection and carries no legal significance in the United States or other countries that comply with the Berne Convention. To ensure adequate copyright protection, it is recommended to register your work with the relevant copyright office.