Forum Moderators: not2easy
But in order to be valid, it has to contain the company/publisher, the word 'Copyright' or the © symbol and the year(s).
A copyright notice has 3 elements:
1. The symbol ©, or the word "Copyright," or the abbreviation "Copr."
2. The year of first publication of the work; and
3. The name of the author.
While use of a copyright notice was once required as a condition of copyright protection, it is now optional.
What is a copyright notice? How do I put a copyright notice on my work? [copyright.gov]
When is my work protected? [copyright.gov]
Your work is under copyright protection the moment it is created and fixed in a tangible form that it is perceptible either directly or with the aid of a machine or device.
There's a wealth of information available at the US Copyright Office web site.
[edited by: eelixduppy at 9:30 pm (utc) on Feb. 18, 2009]
On the other hand, many foreign sites are hosted in the US, so you can contact the host directly and have the site removed under their copyright policy. And if the copying is really obvious (word-for-word the same, identical formatting and colors, etc), posting the URLs (yours and theird) to "pirated-sites.com" couldn't hurt. When the majority of their traffic is people laughing at them, they might see the sense in removing the plagiarism.
Eliz.