Awhile back, I posted a tutorial describing the creation of a copyright brush. It was a very popular tip, but it has one drawback, brush sizes are fixed. In order to accomodate a wide variety of image sizes and resolutions you'll need to make a lot of new brushes.
Why not create a re-sizable shape that communicates the same message?
Create a new document with a white background.
Press the D key to make Black your foreground color.
Select the Type tool and type your name. You can add a copyright symbol if you like.
Ctrl + click the type layer to select the type.
Choose Image > Crop to reduce the size of the document to the size of the type.
Choose Layer > Type > Convert to Shape. The type is converted.
Choose Edit > Define Custom Shape
The Shape Name dialog box appears. Name the shape.
Select the Custom Shapes tool.
Scroll down to last position in the Shapes dropdown menu to find your new shape and select it.
Now you can add your copyright to an image by SHIFT + clicking and dragging the mouse. The Shift key constrains the proportions of the copyright ensuring the best legibility. Because it's a vector shape, you can make it any size you want without sacrificing quality. Nice.