Final answer:
The digital millennium copyright act states that most works published since 1977 will remain in copyright for the life of the author plus 70 years after the author's death.
Step-by-step explanation:
The Digital Millennium Copyright Act (DMCA) states that most works published since 1977 will remain in copyright for the life of the author plus 70 years after the author's death. This applies to works created on or after January 1, 1978. However, there are some exceptions, such as works made for hire and anonymous or pseudonymous works, which have a shorter duration of copyright.