> Would you be able to provide a summary of the FreeBSD implementation?
> Might help folk guage whether its likely to be acceptible - and therefor
> whether you'd be wasting your time working on porting it.
>

Quite simply, FreeBSD's implementation is Posix 1003.1e.  It's a withdrawn
draft, but is becoming the de facto standard regardless (used in FreeBSD,
Linux, XFS, Samba, and others).

It's basically the ability to specify access (rwx) on an individual and/or
group basis.  It's conceptually quite simple.  How it's stored on disk is
implementation-dependent and varies considerably.

Ken