Copyright applies to things that express creativity. But also it does not apply to things which are strictly dictated by technical/compatibility requirements, e

Copyright applies to things that express creativity. But also it does not apply to things which are strictly dictated by technical/compatibility requirements, even if they originated as an expression of creativity. So editline, Wine, Linux, Dalvik, and dynamic linking should all be OK (unless there's internal copying beyond what's needed to externally conform to the ABI/API).