Locking or making a folder read-only

[Rez P]

In our CVS repository we have 2 main project folders:
 
LegacyCode
NewCode
 
LegacyCode is no longer being developed and I would like to freeze it or lock 
it and make it read-only but make it accessible for future research.  Is it 
possible to do that and how?
 
Thanks
 
Rez                                       
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