It can be. Notification is not required for protection.
If it was not protected by copyright when it was created, and not published with notice before 1 March 1989, it is in the public domain and cannot be protected.
"Copyright obtained" is an unnecessarily wordy way of saying the material is protected by copyright.
No; in 1953, formal registration was required for protection.
Ideas cannot be protected by copyright, only the expression of the ideas.
No. Since 1989 it has not been necessary to put a copyright notice on any work in order for it to be protected
Generally yes it it. The requirement to list a copyright notice in order to be protected was discontinued over 20 years ago.
Your original works, on your Wordpress blog, are automatically protected by copyright. Using others' copyright-protected works on your Wordpress blog requires an exemption in the law or permission from the copyright holder.
If material is not protected by copyright, the creator has no rights to it. For example, a person preparing a document in the course of his duties as an employee of the US Government has no rights to that document, because it is not protected by copyright in accordance with section 105 of the copyright code.
You will find that most material on websites is protected under copyright. The website owner should be able to tell you who the copyright owner is. You would then negotiate a price with the copyright owner to allow you to use their material.
Yes. You are willfully duplicating a protected work without the permission of the copyright holder.
An invention or idea cannot be protected by copyright, only by patent. The content of a description of an invention cannot be protected by patent, only by copyright. Printed matter recorded on a CD cannot be protected by patent, only by copyright. The way printed matter FUNCTIONS on a CD can be protected by patent but not copyright. The way the same material can be USED can be protected by copyright AND patent. You cannot patent or copyright something that was copied from someone else's work. So the answer would depend upon what aspect of CDs you're referring to.
If the material is not protected by copyright (e.g., it is in the public domain, or is a work of the federal government), it is legal to download.