[ska]

I presume you meant one way NDA, your overall point is a really good one. Contracts are very useful as a leading indicator of how the counterparty thinks about the relationship.

[baobabKoodaa]

I've never seen or even heard of one way NDAs.

[prasadjoglekar]

If you go interview at a Facebook office, you'll be asked to sign one before they let you in. Basically - "we'll tell you stuff. That's confidential. You tell us stuff. That's not confidential".