Bertrand Harris Bronson's sources are meticulously credited, and every single tune included was, where not in the public domain, printed by express permission of the copyright owner(s), some of whom are still living. The four volumes of Traditional Tunes of the Child Ballads were published between 1959 and 1972; it was an epic work. As I indicated earlier, each tune is a separate case.

How copyright issues may affect whatever it is that 'Anice' wants to do is impossible to guess at without knowing what it is that she wants to do; and it may be that advice may not come most usefully from somebody who has never heard of the books or their editor. Meanwhile, I'd repeat that she would do well, if she hasn't already done so, to read Bronson's own thoughts on the subject.