How do you get a liber number?

Answer 1

A liber number is issued by a public records authority on documents which it has recorded. Also known as "book and page number", it originally referred to the actual physical journal in which copies of public records were bound. As the volume of legal filings have grown over decades and centuries, many public records authorities have began storing documents in electronic format.

The electronic copies are often journaled by the date on which they are filed, resulting in a "serial number" of sorts. Even though this number no longer results in a "book" and "page" number, the serial number for the recorded document is still known as the liber number.