If I could change one thing about the way we talk about copyright, it would be to replace "protected" with "encumbered," at least in the library context. An out-of-print book from 1950 with a dead author and a defunct publisher is not "protected" by copyright; it's encumbered. 60-year-old newspaper articles, 10-year-old political ads, on and on - vast swaths of in-copyright material with no commercial life but some remaining intellectual value aren't protected by copyright. They're encumbered.