Rush is very possessive of his Paul Shanklin (sp?) pieces. Notice that when he plays them, he almost always speaks over them (in my opinion, to keep people from recording them). As well he should, I’m sure he pays a pretty penny for them.
I remember back when Rush would talk over his update themes and actually say it was to protect them of copying. Your opinion is right on!
And .. because he speaks over them .. there’s no way other stations can play them and why they had to make one up - and he caught ‘em!!