I dont know that there is one. Thats the mutual part of the respect. You have to respect the student's wishes, as much if not more than they have to respect yours.
i cant imagine any teacher I have ever had refusing to give his blessing on a student leaving to study something else. For that matter, I cant imagine anyone that isnt a nutter doing it.
By the same token, i have always told my instructors "thanks, but I am gonna go do something else" whenever I left a school.
It isnt just a business. A good martial art school is more akin to a family than a business.
That's what I was saying in the last thread, "OHANA" family. And maybe "permission' was a strong word, but you do this out of respect for your teacher. Is my loyalty blind? No! Do I do things just cause he says, no.
Yes, my instructor and I are close, my boy calls him "Grammpa" and if it's just about paying money and learning something, well I haven't paid him anything in years. As with all his students, yes rent and bills must be paid, But he does it for the love of the art.
When I was single, we were roomies. I can remember more than one occassion being woke up at 1am for training. We have bbqs, parties we all go to each others houses and yes when crap has hit the fan with one of our students we have all come to help.
Tellner, we call him our teacher,many call him "uncle". You seemed to be hung up by the title of GM. It is a title he has earned. My dad and uncle were BB from Sijo and earned the title GM. Just as your WHKD si gung, Al is also a GM. But they are titles. Maybe the term "Master" is what they used to call someone who has done one thing their whole life and has for the most part "Mastered" their art. Does this mean we are all Jacks. Jack of many "master" at none. You have master electricians, master plumbers, and masters in their arts.
So to ask "permission" knowing he'll say go ahead is just respect.I am not saying to get on your knees and ask, I'm saying to let him know that is your plan. If you do have a bad teacher he won't give any "blessing" and your choice is easy, if gives his "blessing" your choice is the same. but I think you owe your instructor at the very least the courtesy of doing so.