Why do lp and lpr return unauthorized?

I'm running Ubuntu 10.04 with latest updates.

Here are my system's protections for lp and lpr.
root@steamboy:/usr/bin# ls -l lp
-rwxr-xr-x 1 root root 13540 2011-09-12 10:41 lp
root@steamboy:/usr/bin# ls -l lpr
-rwxr-xr-x 1 root root 13540 2011-09-12 10:41 lpr

Only if I sudo can I print something at the command line, else
I can unauthorized.

I do have an smb printer with username and password embedded, but I believe this problem occurred during one of the 10.04 updates. So my question is what would cause lp or lpr to return Unauthorized?

ics@steamboy:~/icsdev$ lp x.tmp
lp: Unauthorized
ics@steamboy:~/icsdev$ lpr x.tmp
lpr: Unauthorized

(x.tmp is a real file.)