Patent laws and Copyright laws prevent others from stealing your ideas.
But were those ideas really yours to begin with? Or did you just happen to be in the right place at the right time, thinking the right thing?
It seems like when the time is ready for a truly revolutionary idea to come forth into public awareness, it just comes forth through whoever happens to be available at the time to notice it.
I can think of some notable historical examples including the invention of the telephone, the television and the radio where independent inventors had similar ideas at similar times - and often fought with each other afterwards over whose idea it originally was.
I'm sure there are many other similar examples.
If we accept that ideas may just be manifestations of the collective desires of many people and actually originate from the Universe / God / Oversoul / Collective Consciousness etc (whatever term you prefer), does it really make sense to allow certain individuals to own those ideas?