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How do you tell if it is copyrighted? Like if there are no circled C's and such...
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Mark, I'm glad you asked! [img]/ubbthreads/images/graemlins/grin.gif[/img]
According to the Berne Convention, which is the international treaty that sets up the basis for copyright laws amongst all of the signatory nations (and that includes just about every nation in the world, now), an intellectual property (such as a song, a photograph, a play, etc.) is copyrighted at the moment it is created!
And, that copyright extends for the lifetime of the creator, plus 75 years.
So, it is safer to assume that EVERYTHING ON THE INTERNET
is copyrighted by someone than to assume that it's not (since most of the work you're using was created sometime within the last 75 years, right?).
Putting the copyright mark on the work is an added protection for the creator - that's why I always do it on my images that are destined for publication on the web - but it is not necessary in order to be protected by the copyright laws. And, neither is registration of the work with the appropriate copyright catalog... which, in the United States is the Copyright Office of the Library of Congress.
In fact, there is a heap of information that teaches about what copyright is, and isn't, on the Library of Congress's web site...
Copyright Questions and Answers from the Library of Congress
Hope that helps a bit! And, again, thanks for asking!