Ask HN: What do companies do to protect source code?

Yes, there are NDAs and legal agreements to discourage rogue employees from sharing source code in the public.

However, do they have specific processes to ensure that employees don't have full source code on their machines / laptops ?

I have read that some companies like Facebook and Google don't allow employees to check out code on their laptops. Code is checked out on developer servers and employees connect to these to work.

We need a similar setup in our company, and are looking for pointers to how we could build one.

Are there are any products or open-source projects which help in this ?