Step 1: Spot the key words.
Two words matter here: permission and agreement. Permission is given by the creator, and agreement is a deal between two sides.
Step 2: Classify the four terms.
Trademark, copyright and patent are all rights that protect something: a brand, a creative work and an invention. Licensing is different. It is the act of allowing another person to use a protected work on agreed terms.
Step 3: Eliminate.
Since the question asks about an agreement and not about a right, options 1, 2 and 3 are set aside.
Step 4: Confirm.
When software is sold, the buyer gets a licence, which is the creator's permission to use it. This is the same idea as in the question.
Step 5: Pick the answer.
The blank is filled by Licensing, option 4.
Step 6: Extra check.
A real example makes this clear. When you install a program, you accept a licence agreement. The company owns the copyright, but the licence says what you may do with the program. That agreement is what the question describes.
Final Answer:
The term is Licensing, option 4.
\[ \boxed{\text{Option 4: Licensing}} \]