An original piece of work is covered by copyright. It could be a piece of music, a play, a novel, photos or a piece of software. Copyright can be enforced by law. It is against the law to copy and distribute copyrighted material without the copyright owner’s permission.
Software is covered by copyright. It prevents:
There are exceptions. Some copyright owners allow their work to be copied and distributed for educational use or for non-profitable use. The copyright owner will make this clear.
Images returned by search engines do not belong to the search engine and are not free to use. The search engine has included them from a number of websites. All of the major search engines provide a link to the website that the original image is from. If you want to use an image you have found using a search engine, always check who it belongs to.