Strict Locking for checkouts

[jpablo]

        I need to stablish a strict lock on each checkout on my repository,
and then, when a user try to checkout a locked file, I need to denie
access.

        As far as I see, I can a do a cvs admin -l to make a lock and use
rcslock.pl in commitinfo to deny access for checkins... I have 2
question. 

1- How can I automate the strinct locking creation? I cant not rely on
users for this, I need some automated method to lock on each checout.

2- As I see rsclock only works for checkins.. how can I do to make
this work on checkouts? In my implementation a user can not checkout a
file if another user is working on it.

Thanks in advance!