Howe to batch change the exif data of dng's?

So I was using Wazza's 20D for most of the weekend, and I've now noticed that all the pictures in Lightroom are under his name (through the exif info from the camera)

I can change it one at a time, but how do I do a batch change? There are a few hundred pics to go through. I only want to change the owner attribute, nothing else

Simplest way might be to change File > Info in an Action, then you can batch process all of them. I don't think it will remove his name, but you'll be able to add yours to the important areas, like ©.