What is four ways material is considered public domain?

Answer:
Materials enter the public domain if...
  1. Copyright term has expired
  2. Protection was not renewed (renewal is not available for new works)
  3. The creator voluntarily donated the work to the public domain
  4. The material is a work of the federal government in accordance with 17USC105
First answer by Gospodyina. Last edit by Gospodyina. Contributor trust: 196 [recommend contributor recommended]. Question popularity: 1 [recommend question].