Subversion - prevent changes to a tag

I’m looking to prevent changes to any tags via a hook script.

I’ve found some good info on the forums. I see that DreamHost does have the hook templates available in ~/svn/[repository_name]/hooks and that removing the .tmpl should get those executing.

However, according to the book I use ‘Pragmatic Version Control With Subversion’, the other thing I’ll need to do is configure permissions with commit-access-control.cfg which I cannot locate.

Any ideas?