I plan to create a video to promote my idea for an app. Quite similar to how Google's Pokemon Challenge Video turned into Pokemon Go. I would like people to see how my app would look like and how it can be used when it is finished. I guess I am a little paranoid on people actually copying my idea. Do I have to get a copyright for my idea or can I do something else?
In no case does copyright protection for an original work of authorship extend to any idea, procedure, process, system, method of operation, concept, principle, or discovery, regardless of the form in which it is described, explained, illustrated, or embodied in such work
If you want protection, keep your ideas to yourself and create a concrete expression in the form of a program, which is protected by copyright.