Which of the following is a FALSE statement?

1.The E-Sign or Electronic Signature in Global and National Commerce Act is a federal law in the U.S. that makes electronic signatures equally as valid as written ones.

2.The Fair Use doctrine is an exception to copyright law.

3.Registration of a copyright with the U.S. Copyright Office is mandatory in all cases in order to have a valid and legally protected copyright.

4.The Digital Millennium Copyright Act states that an Internet Service provider is not liable for copyright infringement by its customers unless it was aware of its customers' violations.