Branch philosophy

Hello,

I read the book about how to make a branch throuugh cheap copy, but
there is still one thing I'm not sure about:

How is it possible to close a branch ? When all work is finished on a
branch, and this branch has been merged with a trunk, I would like to
prevent anyone from still working in this branch (I guess I could use
permissions to handle that), and to make sure nobody can see this branch
ever existed when they look at the HEAD of the repository. Is it a good
practice to delete the branch in this case?

Regards,

-- 
Loïc
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