I will perform for a regional channel next week, and i will do effects that were not created by me, but all of them will have my own twist and handling, so it´s not properly doing something that has been created by someone.
And if you for example perform a effect from Dai Vernon or Marlo, what would you do? Ask permission from who?
The only thing i think is reasonable is to give the credits of that effect on the end of the performance, but on the other way i thing that when you buy something from a magician you automatically should have the rights to perform anywhere and anytime you like, because you are not only paying to learn the effect you are paying to perform it.