That's when you probably push the fast-forward button so you can watch your movie. If you stopped to read the warning, it would tell you that it's illegal to copy the video, or to show it to make a profit. Computer software is legally protected, too. You may find the licensing agreement inside the box when you open it. Or, a licensing agreement may appear on the screen when you load your new software.
Most people never read it.
Licensing agreements differ, so read each one carefully. Copyright laws in the U.S. and Canada protect a person's right to control the reproduction and distribution of his or her creative works. It is illegal to duplicate software, to make multiple copies for personal use or for use within an organization, or to give an unauthorized copy to another individual, without permission of the copyright holder. You are liable under the copyright law if you know someone else is going to make unauthorized copies and you offer to help. To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries.