Intellectual property is protected by laws specific to the expression of an idea. Copyright is the law specific to the expression of ideas in visual or audio form. Unlike a trademark that indicates a specific item or design is protected, copyright covers a different expression of thought.
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
Public domain works can serve as the foundation for new creative works and can be quoted extensively. They can also be copied and distributed to classes or placed on course web pages without permission or paying royalties.
A work is generally considered to be within the public domain if it is ineligible for copyright protection or its copyright has expired. Public domain works can serve as the foundation for new creative works and can be quoted extensively