What is a copyright?
It is a set of exclusive rights regulating the use of a particular expression of an idea or information.

How does the copyright for images, sounds, and presentations actually work?

Without copyrights for ISP (images, sounds, and presentations), people would be using them for their own websites and take full credit. There would be plagiarizing all over the place but no one would know where the original came from and if you were really copying anything or not. Copyright laws have helped website makers and other people with originals tremendously. To make sure that you are not breaking a copyright law and plagiarizing, you must site the source of where you got your “information” from and give credit to the original owner. There are a many guidelines for ISP copyrights. Here are some of them:

1. All copyright and licensing tags should be put on a line of their own.

2. Along with a tag, specify the source or copyright holder information. Provide as much detail as possible.

3. If an image is not licensed under a standard license, please specify what the actual license states.

4. If you tag an image as requiring attribution, please specify who needs to be attributed.

5. If multiple categories apply to an image, add all that apply.

Source: http://itgssyllabus.blogspot.com