how can i only allowe members to view threads from a specific board

[Floryn]

i have a SMF forum were i have a board  were i will post free (GNU license) script, but i don`t want guests to see the topics from this boar... i meen i want them to see the category, but when thei try to acces it to get an error like "Only registred members are allowed to see this board... please register here"

Anyone knows how i can do this ?

[Kindred]

ther eis either a mod or a tweak for this...