Dear RB, You have been taught some good points about powwow protocol. It is considered as you say that songs given to, or made for particular persons, families, communities, etc. not be sung without permission. Even if one has permission, singers must not use it inappropriately. For example, many songs in this category may have no words, and if a singing group sings it for an intertribal, they will probably be pulled up short. This is a little different from the non-native idea.
Lets say a drum sings a family's song without permission.
Then they will immediately go before the people and publically admonish them for singing that song. Very embarrassing for the singers. 2. as recompence for what they are about to receive, a stern public scolding and request to not sing this song again. I personally hesitate singing songs released on tape, though for the most part many groups don't mind if you sing them. There are some exceptions however, of individuals who don't like others singing their music.