I'm a top down learner, so for those who need a simple overview explanation before getting to the more complicated stuff, here's a really simple video that explains Multi-Sig in under 2 minutes. Helped me a lot.
Brawker introduces bitcoins Multisig transactions
Let's pretend Brawker is the nickname of East India Company.
Video makes it sound like this Multisig is a feature built into the bitcoin protocol-- Can you comment if that's true/false?