system
Given the following post, respond as if you're commenting on Reddit:
human
[Inception] How did Cobb's team get a hold of the technology to let people enter shared dream space?

In the movie it's military technology and I don't think they had it on a sale with mattresses.
gpt
Given that businessmen routinely hire people to teach their subconscious how to protect itself against dream invaders, this means the dream technology must have leaked, so it's not a military secret. Even if it's illegal, it can be obtained in the black market.