The original work painted by DaVinci has been in the Public Domain for centuries. A pure photograph of it with nothing more will probably also be considered in the public domain, but that depends on the country if there is an issue over it.
A new painting of it where someone did their own interpretation would be protected.
Trademark yes copyright no.
Drugs and other pharmaceuticals are protected under the patent laws not under the copyright laws.
B. intellectual; copyright
Materials on the internet are protected by copyright, just as their analog counterparts.
Ideas that have been expressed in a tangible medium can be protected by copyright. Ideas for improving processes can be protected by patent law.
No; in 1953, formal registration was required for protection.
US copyright laws can be copied to your heart's content, because as works of the US Government, they are not protected by copyright law, in accordance with...themselves.
According to copyright laws in most countries, "musical works" are specifically listed among protected works. The intent of copyright is to encourage creativity, and music is certainly creative.
What you are seeking to do violates copyright laws.
Mascots are more likely to be protected as trademarks.
The full lyrics are not available at this time. They are protected by copyright laws.
Simple facts cannot be protected, but the expression of them can.