Definite bad mojo Dr. D
as Ice44 stated earlier - I do not want to rain on the parade but . . .
I have found very few wallpaper/theme developers that have not crossed over the copyright line (yes, including myself). Actually I do not believe I have ever met a person that has not in some way crossed US copyright boundaries, and goodness knows they are expansive boundaries.
99.9% of the time a person posts an image of a car, mac/vista icons, cartoon characters, movie themes, etc., it is a form of infringement. This is true whether the posting party is offering the content for free or for a fee. The term "All rights reserved" means just that "ALL". The only consistently successful path around this is to provide the content in educational, parody or journalistic context.
You may want to read the following should you be interested in the (very) basic clear description of copyright facts – it will take all of about 2 minutes.
Copyright 101: The following are excerpts I compiled for various professional purposes. Key sources are Cornell Law School, US Copyright Office and the University of Colorado, Wikipedia and Bambooweb. And if you are really, really bored-copyright.gov and search for title17 ~ LOL
The Copyright Act of 1976 is the basis of copyright law in the United States. It has since been amended by several copyright provisions. The last prior primary law was 1909.
In the past, in some jurisdictions (US being one), a work would enter the public domain if it was released without a copyright notice. This is no longer true. Any work receives copyright by default and copyright law generally doesn't provide any special means to "abandon" copyright so that a work can enter the public domain, i.e., any published material is copyright protected - with or without notification. Of course, this is only applicable where laws are in place. No law, no copyright.
Interestingly though, section 411 of the Act does require copyright registration before a copyright infringement action of the work can proceed. This is where the outline provided by Ice44 is prudent in the case of proof. The exercise definitively illustrates the exact date and time a person's intellectual work was established.
There is a false notion that "freely obtained" means "public domain". One could argue that the Internet is a publicly-available domain, not licensed or controlled by any individual, company, or government; therefore, everything on the Internet is public domain - hmmmmm. This specious argument ignores the fact that licensing rights are not dependent on the means of distribution or consumer acquisition. (If someone gives you stolen merchandise, it is still stolen, even if you weren't aware of it.)
Technology columnist Nicholas Petreley once wrote, "Those who want information to be free as a matter of principle should create some information and make it free." I will now take my leave and step down off my soap-box! LOL
Please do not take this post as truth. Go to any search engine or library and search copyright guidelines.
And just for the record I think what happened to Dr. D is truly unfortunate. I have found on more occasions than not, a simple request to the author or to credit the author where due, is all that is required to utilize their intellectual content. I have found this to be true worldwide.
If the automobile followed the same development cycle as the computer,
a Rolls-Royce would cost $100, get a million mpg and explode once a year killing everyone inside.