[phantom_oracle]

If there is something of value, then you'd probably want to protect it somehow.

VCs are in it to make money just like anyone else and if your idea (like a detailed one with implementation and specifics) is good, you can expect them to poach/take the idea similar to what Huli did in the TV series Silicon Valley.

PS. If your idea is consumer-tech, it may have less value than say a patent on some powerful way to extract 100% energy from solar power (or more industrial stuff).