Password protection of part of a site

Hello guys.

Did someone in the community already developed a Radiant extension to
protect with a password part of a radiant-based site (I recall a
behavior of Matt McCray)?

In addition, I recall that someone is working on the possibility to add
finer granularity to accessing part of the admin interface for end-users
(so that they cannot ruin part of the work done by the designer). Will
this extension be made available by the programmer to the community?

Luigi

P.S. FYI, I’m just a designer and not a programmer.