I don't completely understand the License Text.
1. Is Advanced Iframe Pro ($19.00) limited to 1 Domain?
2. What is exactly meant by 'One Client technically?
Have a good time
1. Yes. This is the code canyon license. So please see here: https://codecanyon.net/licenses/standard for details.
2. Never heard of this. Where did you get it from?
I would like to have a different license as this is not perfect for plugins. Especially a multi domain license I would like to have.
I cannot sell this to you - i'm unfortunately bound to codecanyon. I already answered to your direct e-mail as well.