The objective of educators is to share and to deliver quality education to children so as to prepare them for future challenges and in a way contributing in building a better world through the upcoming generation. Educators are not trying to make money out of the educational resources, thus for me there should be no NC in education.
Consider a poem writer, if he earns a living only from his talent then I think it would be wise for him to put the NC restriction to his creations. As far as education is concerned, there should be no NC restrictions. #OCL4Ed