Radon is a dangerous gas. It is colorless and odorless and is always being emitted from our planet-don't worry, it's not enough to harm you.
Copyright for published works in the USA has been according to a federal copyright statute, since the first U.S. copyright statute in the year 1790. Before the Copyright Act of 1976 became effective on 1 Jan 1978, unpublished works were. protected by state law, known as common-law copyright.
Until 1988, a work had to be either registered with the Library of Congress Copyright Office and/or identified by the Â© symbol or a copyright notice statement to be protected by copyright, but today copyright protection is automatically extended when a work is created.