Works for which the term of protection has expired are in the public domain.
If it is no longer protected by copyright, there are no rights to obtain.
No. Since 1989, when copyright law was amended to bring it into alignment with the Berne Copyright Convention, it is no longer necessary for a copyright symbol to be displayed to establish or maintain protection. Copyright exists from the moment you create an original work, and that can be something as simple as a photo of your child.
The law has changed and the copyright symbol is no longer needed to insure the protection of the copyright owner. The symbol for copyright is: ©
No, copying and pasting is copyright though.
Yes.
It means that if you copy something copyright and don't give it its props (or credit) you will be sued
Completed in 1915, "The End of the Trail" is no longer protected by copyright.
It depends on whether you have the right or not. If you control the copyright to something (i.e., you drew/painted/wrote it), you have the exclusive right to copy it or authorize others to do so. If you do not control the copyright, you need an exemption in the law or permission from the copyright holder.
Yes, you should cite all sources. Just because something is no longer copyright does not mean that you can use it freely. You can be accused of plagiarism if you use it without citation.
Works no longer protected by copyright are said to be in the public domain.
No, it should not. If you wrote something, you own the copyright on it. All you need in order to assert that copyright is proof that you wrote something.
They aren't. Copyright protection is for a limited time, while trademarks can be protected in perpetuity as long as they are in use.