best secure IT document repository

What is the best software for storing IT documentation such as Viso files, config files , etc in a secure manner. a plus would be something that can also have some sort of digital signature so that someone could not malicously make a change to the documentation.

thank you for feedback.
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i use truecrypt, a real very very very secure virtual disk.
you van use keyfiles & password to protect it.

it's a freeware (open source)

Keith AlabasterEnterprise ArchitectCommented:
I still use the MS Sourcesafe. Allows version control as well; not freeware but does the job.

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Keith AlabasterEnterprise ArchitectCommented:
Thanks :)
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