Copyright lets an owner of intellectual property control how that property is copied, altered, sold, etc. In most countries you don’t have to register copyright, but your work must be (mostly) finished - you can’t copyright ideas. Copyright works by granting certain rights - the right to reproduce, distribute, broadcast, or make something based on someone else’s work (as well as the right to give other people permission to do any of these) — to the holder of the copyright. Basically, copyright protects the rights of people who have either created a work, paid for it to be created or purchased the copyright from a previous copyright owner.