This is becoming a problem in many photo processing outlets, not just
Wal Mart. Here's an article on the subject:

http://www.detnews.com/2005/business...C06-225211.htm

"Copyright law requires photo labs to be on the lookout for portraits
and other professional work that should not be duplicated without a
photographer's permission. In the old days, questions about an image's
provenance could be settled with a negative. If you had it, you
probably had the right to reproduce it.

"Now, when images are submitted on CDs or memory cards or over the Web,
photofinishers often have to guess whether a picture was truly taken by
the customer -- or whether it was scanned into a computer or pilfered
off the Internet."

Guess your Wal Mart doesn't trust prints, either.