When posting to a newsgroup or bulletin board, it's important to know what a copyright is and to know how to avoid copyright infringement. Copyright infringement is the unauthorized use of someone else's copyright, for example, the posting of another person's creation in a newsgroup or the sending of that person's work of authorship in an e-mail without that person's permission to do so. You can only copyright the expression of an idea. There's no need to give notice that something is copyrighted. As soon as something is created and saved, it's copyrighted, even if there's no copyright notice.
Copyrights apply to creative , original works of authorship.
You can't copyright a name, short phrase, or slogan, or anything like that. If someone posts a copyrighted work to the Internet through a newsgroup or bulletin board, that doesn't automatically put it into the public domain. If you want something you post to be in the public domain, you should state in your post that the information is public domain, and anyone can feel free to use it. An example of fair use is if you respond to a posting, and quote sections of the post you're responding to.