In the US...
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.
Trademark yes copyright no.
Drugs and other pharmaceuticals are protected under the patent laws not under the copyright laws.
A website is considered a "literary work" under copyright law.
Technology would typically be protected by patent law, with the exception of software, which can fall under both copyright and patent.
A copyright protects original material (text, images, audio) recorded in a fixed format. There are two types of copyright, national and international. National copyright only protects original material produced within the country's borders. If your music was produced in the United States, then it is protected under US copyright laws, but not laws of other countries. International copyright, on the other hand, protects your music no matter where it was produced. A European artist can be protected by international copyright laws in the USA, for example.
If it is no longer protected by copyright, there are no rights to obtain.
Ideas that have been expressed in a tangible medium can be protected by copyright. Ideas for improving processes can be protected by patent law.
Yes, "It's a Wonderful Life" is protected under copyright law. The film was first released in 1946, so it is still within the copyright protection period.
They aren't; such inventions would be protected by patent law.
No, you cannot copyright your voice as it is considered a natural and inherent part of yourself and not a tangible form of expression that can be protected under copyright law.
To ensure your work is protected under copyright law, you should create the work in a tangible form, such as writing it down or recording it. You should also include a copyright notice with your name, the copyright symbol , and the year of creation. Consider registering your work with the U.S. Copyright Office for added protection.