That will vary from fair to fair.

Fair use applies to quoting or copying copyrighted writings. For example, it is fair use to quote a sentence from a copyrighted book or article if it is relevant to something you are writing for publication. It is fair use to copy anything for your own personal use, not for profit.

Fair use

Fair use is an exemption to copyright law; using it carries no penalties.

Here's a great example: "I used to incorrectly use to a lot, instead of too".

I am going to the fair, not two the fair or too the fair.