This struck a chord with me...
 protection of data/software contained on the machine or
disks. If you buy a
camcorder at a consignment or pawn shop  and the last owners left a tape of
their after-hours playtime in the camcorder, is it my responsibility to 
erase,
 safeguard or return it? I think not. I feel the same
should apply to 
personal
ABSOLUTELY it is your responsibility.  We lost the first 3 months tape of
our son's birth, homecoming and grandparents meeting, due to the theft of a
camcorder with the tape still inside.  The camcorder was stored at work, in
a locked and alarmed office.  It still got stolen.  Probably it ended up in
a pawn shop somewhere.  I didn't care about the recorder, but the tape was
priceless.  You just never know about data, and in the above situation I
think it is your primary responsibility to make SURE you don't have
something you shouldn't.
We were heartbroken at our data loss.  Just because it's in a pawn shop, or
consignment, or in the dumpster - doesn't invalidate copyright, or give you
a right to do what you will with it.  If you found a personal videotape or
data and make no effort to determine if it is important to the original
owner, then I think you are abrogating your responsibilities as a good
citizen.
Cheers
A