I'm going to chime in here quickly on the removal of copyright information..
This can be done in 2 ways
1. if there is a water mark, clearly it is visable and also removable with some photoshop skills.
2. There is also a way to embed copyright information into the image file itself, so a watermark is not needed, but that doesn't mean it isn't there.
For example all of the images that appear here on one of my blog posts:
http://palmbeachdns.com/wp/?p=2576have watermarks, but they also have copyright info embedded in the file itself, most people would not know how to remove the embedded information, nor would they do it intentionally.. Once they have the image, if they open it in photoshop and do a simple "save for web" this action all by itself will remove the exif and any copyright information within the file itself. Most likely MF doesn't look at just the watermark or lackthereof, but the look at the exif of the file.