My application contains another user code

I want to sell a new mobile and web application on codecanyon.
My application is completed and contains a product belonging to another user I purchased from codecanyon.
This code only %10 in all my code. I used for solve my viewing problem.
I will buy new license from this user for each product I sell.
I can sell this mobile application on codecanyon.
Are these sales licensing rules appropriate?

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You would need an extended license and written permission from the original author