How to prevent a file before commits?

Hello,

I would like to prevent a file (let`s say config.conf) before commits.
I could use svn:ignore but I want to have this file in the repository
-- I just do not want to allow developers to rewrite it by "local"
configuration.

How can I do this?

Thanks in advance for help

-- 
Lukas Zapletal
http://lukas.zapletalovi.com
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