As a content creator, the best thing you can do is to register your copyright, and note on or in the material the copyright date and owner (for digital materials, it's very useful to include this in embedded metadata).
As a content user, you need to be aware of what types of uses require permission, and how unlicensed uses effect the industry.
Copyright law cannot protect ideas, only the expressionof them in writing, sound, art, etc.
Depending on context, the answer to this could be copyright law generally, the Digital Millennium Copyright Act, Digital Rights Management, or any number of things.
It requires permission from the copyright holder or an exemption in the law.
It doesn't. Patent law protects inventions.
it protect the rights of authors creativity
Copyright law in general does not protect ideas, but rather it protects the expression of those ideas.
They use the copyright law to protect the proprietor (owner) from plagiarism and copyright infringement. This is useful because the ideas of others will stay their ideas as well as entitle them to all benefits and profits.
In the US, since copyright law was amended in 1989, it has not been necessary to display a copyright notice for protection.
To copyright a word and protect its use and ownership, you can't do so through copyright law. Copyright law protects original works of authorship, such as books, music, and artwork, but not individual words. However, you can potentially protect a word through trademark law by using it in commerce to identify the source of goods or services. This would give you exclusive rights to use the word in connection with those goods or services.
Although copyright law wouldn't protect your image, you may be protected by privacy laws, depending on the circumstances under which the video was filmed, and whether you had a "reasonable expectation of privacy" at the time.
Copyright law famously does not protect fashion.
Neither Copyright nor Patent law protect domain names.