Permissions on "shared" repository proyects

[Martinez Pla,Jose Antonio]

        Hi all, I´ve got one question that it´s giving me a head-ache so....
here is it:

        I have a cvs repository on a Sles 8 system. Some developers are
working with it with a websphere studio
        with their proyects but I have to commit a proyect to the repository
that I only want developers to have
        read access about it.

        I have read that I can create files "readers" and "writers" on
CVSROOT folder so users in first file have
        only read access to all the repository, and users in second file
have read/write access.

        Other chance I´ve try is to give "physical" permisions to proyects,
so I have one proyect "proyect_1" that
        belongs to user "admincvs" and group "cvs" with file permissions (r
w x r - x - - -), but when I try to get the
        proyect from the repository to the websphere studio, I get the
following mistake:

                El servidor informó de un error mientras se estaba
ejecutando el mandato "cvs checkout".
                 : cvs server: failed to create lock directory for
`/opt/cvs/repositorio/ComponentTest Sample - HTTP Recorder' 
                (/opt/cvs/repositorio/ComponentTest Sample - HTTP
Recorder/#cvs.lock): Permission denied
                 : cvs server: failed to obtain dir lock in repository
`/opt/cvs/repositorio/ComponentTest Sample - HTTP Recorder'
                 : cvs [server aborted]: read lock failed - giving up

        The question it´s next: is it possible to give only read access to
an especific proyect (folder), but not to all the
        repository ? if it is, how can I do it ?

        Thx very much.