Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to get digital rights to a book [title] Determine the copyright status of the book. [step] If the book is no longer subject to copyright protection, anyone can publish or distribute it without needing to get permission. [substeps] Copyright doesn't last forever.

Ending1: Digital rights come with multiple rights, ranging as many as four other rights, one in particular. Authors can register for physical rights only if they have a business address or registered business surname that they use or an agent. Ending2: The most important sign on an email or letter to an author, document, or even other non-copyright holder, is that the text is properly and clearly recorded in the text. Both digital and non-digital copyright holders and non-digital copyright holders must prove that the original text is indeed written by the author. Ending3: After the copyright expires, a book falls into the public domain and anyone can publish it. As a general rule, anything published in the united states before 1923 is in the public domain. Ending4: However, a copyright does not have to last forever. Whether the book is new or existing, you must have written and maintained the book, in order to get it published.

Answer format: ending1/ending2/ending3/ending4