On 0, Casey Brown <cbrown1023.ml(a)gmail.com>
scribbled:
There are three "levels" or types of
deletion:
1. Blanking --> simplest, anyone can do this and view the blanked content
in
the history
2. Deletion --> admins can do this easily, other admins can see this and
it
is shown in a public log
3. Oversight --> [[m:Hiding revisions]] revisions are *permanently*
removed
from the database by those with the
"oversight" permission, can only
be re-added by developers (I think root). However, there is a private log
that shows a *little* information. Oversights (people with the oversight
permission) are assigned by ArbCom.
--
Casey Brown
Don't forget level 4: "Deleted off the hard disks completely." IIRC,
everything that was deleted (#2) before something like March 2004 was
accidentally completely deleted (#4) by the devs, and of course we only
comparatively recently got true #2 deletion for images (that is, allowing
for admins to undelete).
--
gwern
Actually, it would be 4) unlinking, where you delete the entry in the
file system that says where the file is on the hard disk, and 5)
shredding, where you overwrite the file in zeros.
Armed Blowfish