Well, actually, I'm pretty sure that if this was possible then people would. Hey, it's a car. Who wouldn't want to download a car?
However, as its not yet possible, I dare say some people would make do with downloading your unprotected photo of a car. Then printing your photo of a car. Having the photo of your car stretched on canvas. Selling that photo of your car stretched onto canvas to a mate, because, hey, you can't download them yet and photo's of cars are cool. Having other people see that the photo of your car can be stretched on a canvas. Asking for their own stretched canvas of your car and putting your picture of your car on their walls.
Oh no Micheal, it appears we've been copied.
Before you know it your picture of a car is a worldwide sensation and has it's own branded clothing range and TV show staring David Hasselhoff. The person that downloaded your car photo now owns that car and drives up and down your street, taunting you that HE took the picture and you can't have it or prove it's yours. Plus, he just downloaded a car by proxy. Amongst pirates.....he's untouchable.
So, how are you going to protect your photo of a car and stop David Hasselhoff crashing it through a burning building on ITV every Saturday?
Back when I were a lad, we had pens.
Back in the days of film, photographers carried pens and paper (remember pens and paper? wow). Along with the odd doodle of a monster spider eating a client, photographers also recorded information on images they took, such as shutter speed, aperture, date, name of client, hotness of client etc. This info specifically tied the photo to an information source.
Nowadays you can't do doodles, but almost every modern day digital camera has the capability to store information right into the photograph. EXIF or Exchangeable Image File Format (if you care) data contains a range of settings like the ones you had in the notebook. ISO Speed, Shutter Speed, Aperture, White Balance, Dark Matter Energy, Camera Make and Model, Date and Time, Date and Time of restaurant booking with Model, Lens type, Focal Length and more. I may have made a couple of these up, but you get the gist. Basically it replaces your notebook.
Enter the Exifier. Hot or not?
It's not a sure fire way to protect your image as it can be deleted, but what it can do, providing it's not been removed, is allow you to search the interwebs and make it a little easier to find it. If you want to add some EXIF goodness to your images, you can do this on windows relatively easily in the properties, but with Apple *shakes fist*, as is the norm, you need a third party software. So, for multiple files and with fruit based operating systems something like the Exifier may be a way to go. You can also add tags. We recommend tagging hotness of client.
Hassle the Hoff.
So to summarise,