They're not bound to be distributed (8)
I believe the answer is:
leaflets
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for leaflets that I've seen before include "Pamphlets giving information, often to advertise" , "Little growth" , "fliers" , "Flyers" , "Brochures, pamphlets" .)