pre-commit hook question

Hello,
    I wrote a pre-commit hook that prevents users from running svn
commit against a path that includes "releases/"; unfortunately, this
hook also prevents users from creating new releases. Can I write a
pre-commit hook that will allow 'svn copy http://svn/trunk
http://svn/releases' but not allow a svn commit into the new release
branch. Or, to put it differently, can I write a pre-commit hook or
other software that will allow users to create a new branch but not
update the branch once created.

Thanks,

-- 
Tim Van Epps
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