Programmers who copy and paste can always copy the fragment they need, no need to pay attention to headers. Ultimately licensing relies on people operating in g

Programmers who copy and paste can always copy the fragment they need, no need to pay attention to headers. Ultimately licensing relies on people operating in good faith. Even without explicit licensing, there is an implicit copyright on works such as source code, so taking code from random places without checking out the license is never warranted either way. > If I use the suggestion you make, then by them copying files into their project they have changed the licence of a file (it now inherits whatever their project uses). No, the only one who can actually change the license of a file is the rights holder, so the person who copied the code while ignoring the license misrepresents matters but does not change anything about how the work is licencsed.