Ok so I messed around again to figure out how I did this. I did it using the built in editing software in Windows 7, I think Vista has the same thing but i'm not sure on that. Open the picture, and at the top left corner there should be an "edit, organize, or share" button. That'll open up a list of all the pictures on the 'puter, with the one you opened highlighted/checked. Double click on the one you want to edit and it'll open it for editing. Click the "view" tab and zoom in towards the plate if needed. Then from the "edit" tab, click on the retouch button, and you can then click and drag over the plate. When you release the mouse button with the area selected it'll make an attempt to blend the selected area in to match the surrounding textures. It seems like a hit and miss thing. It'll always blur out the numbers that it can't be read, but sometimes it looks really good and other times it just looks like someone scratched the numbers out with a pen, or it tries to blend it with the tail lights which looks pretty bad. If it looks poor you can click undo and give it another shot, or highlight it again. The more times you do it, the more blended and unreadable it will get. It seems that it was pure luck how well this plate turned out for me because I haven't been able to duplicate the same "plateless" effect on any other pictures.