Does a Copyright last forever

Answer 1

Yes, although legislators have been steadily increasing the term of copyright, so nothing new has entered the public domain for many years. Many works will enter the public domain in the US in 2018 and in 2037.

Answer 2

No, as a general rule of thumb copyright expires at the end of the calendar year 70 years past the death of the original author.

Answer 3

Yes, a copyright, under the US Constitution, is "for a limited time", which can be 120 years or more, depending upon circumstances.