People do it to AmericaFree.TV all the time. I send them letters
asking to mention us and
spell the name correctly.
You can detect this by looking at the log files; google searches
on your posted descriptions of your streams
can also be interesting.
I've had this happen a few times. With only very few exceptions,
the "thief" has acknowledged the source and provided a link back to
us. In the small number of cases where that wasn't done, I've
asked for them to clearly list the source of the video with a link
to its original location. There's only been one truly nefarious
incident where the naughty people actively tried to scrub our ident
bug from the corner of the stream. That's the only "take down"
notice I've ever sent and they complied. I look at it as free
advertising. :)