Copyright

A teacher would like to reproduce an entire article from a published magazine. They state that because it is only 10% of the entire magazine, it falls under fair use.

What qualifies as a legally owned copy of a movie?

Teachers at our school like to use pictures from movies to decorate their doors.  What rules apply to this?

Our school district offers a Community Education program that offers courses on a broad range of topics to the community.

The question, as a follow up to the Oct 31, 2019 post about showing movies an

I would like to decorate a cart for use in a free books initiative I am planning for our school. Our art club is interested and willing to paint and design it.

Recently, our library has been given a collection of photographs that were previously on display in a local business location.

A member asked about a request for the library to provide copies of photos from yearbooks for a class reunion.

Amazon.com sells audiobooks. One of the formats is an MP3 CD. The image of an example box says the MP3 is transferable. 

Is public domain based on the copyright of the work OR is it based on when the author died OR perhaps it is based on something else?