Let me help you with your studies:
When someone created a work, be it an image, a program, written words, songs, etc, they have absolute control over what can be done with it. No person is permitted to make copies, use it or abuse it without permission.
Using other people's work without their prior written permission is classed as theft.
All countries around the world have agreements that mean people breaching copyright can be extradited and tried for it. Most countries can imprison you for up to 25 years and impose unlimited fines for breach of copyright.
Any one found breaching copyright on this forum can expect rapid and very definite action.
Does that help?