True, all works are derivative. But not all works are derivative of something that is still in copyright.
In practice there's little difference. Everything created while your parents are alive will be in copyright until after you are dead.
For this reason, at least in some countries, subtitles are NOT considered derivative works.
Which countries might those be?
Initially Apple left off an easy way to manage open applications.
From System 7 (2Q 1991) through Mac OS 9.x, the application's icon at the top-right corner of the screen was a menu listing open applications. Or was that in some way too hard for users to discover? In any case, it was easier to discover than the hot corners in Windows 8 that hide an invisible Start button at the bottom left and the charms bar at top right.
All seems condemned in the long run to approximate a state akin to Gaussian noise. -- James Martin