As design creatives we understand the time, love and care you put into your work and how wrong it is for others to steal that work and use for their own gain. Protect My Work is a strong deterrent against the theft of your work. Once you can quickly prove ownership of your creative work, this usually stops continued use of your work without.
You may express your ideas in writing or drawings and claim copyright in your description, but be aware that copyright will not protect the idea itself as revealed in your written or artistic work. Does my work have to be published to be protected?