a question..when I use the watermark feature the images itself it not changed - but merged with my logo.. this is the way I use it now, but I would like to add the logo directly into the uploaded images.. is that possible ?
Have you tried 'watermark on the fly' in admin > Show Photo Options > Enable On-The-Fly Watermarks, you'll need GD2 installed on your server and you must edit the 'watermark.php' - hopefully this will fit the bill.
Inside? like some meta/exif information? i think there's some specialist software on the web for this, i've heard one piece of kit which comes with photoshop which can track your pictures on the web...cool, more nfo here > http://www.digimarc.com/watermark/imagebridge/