<font color='#0000FF'>Unfortunatly it is more complicated than that...
but for a cheap and easy proof of creation date.
put your ideas in an envelope and date them, send them to yourself or friend in the mail so that they pass through the postal service, and are stamped with a date from an official government office (the postoffice)
then keep it sealed in a safe place, if someone takes your ideas you have dated proof that your work is from when you say, but you still have to prove that it wasn't paralel development, and the like.
Copywrite laws are complicated and well documented in just about every city library, go there first, its why its there.