If you don't want others to use your photos and images without your permission, you can create a so called custom watermark with your name or any other text you want.
Did you know you can use your camera with Adobe Lightroom to shoot photos and display them directly on your computer screen? It's called shooting in tethered mode.
RawTherapee is a free open source application for opening and editing RAW image files. It works on all major operating systems such as Windows, Linux and Mac OS X.