making a read-only module in a read/write repository

Hi

We have a CVS repository containing many modules and I need to make a
couple of these modules read-only but maintain read/write access for
the other modules in the repository. I have tried simply changing the
permissions of the modules on the server to read only but this leads
to failure in creating read locks.

Another option is remove the write bit from each of the ,v files, yet
this will still allow new files to be created in the module.

Is there a way to specify a writers/readers file on a per module basis?

Cheers

Adam