Duration
Normal: 2–5 years post-relationship. Concerning: 'in perpetuity.'
Scope
Normal: marked or clearly proprietary information. Concerning: 'all information of any kind.'
Mutuality
If you'll share sensitive info too, the NDA should be mutual. One-sided is fine for hire / vendor work.
Standard exceptions
Public domain, prior knowledge, independent development, court-ordered disclosure. Missing all four is a red flag.
Hidden non-compete
Watch for restrictions on where you can work next. That's a non-compete, not an NDA.
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Not legal advice. For informational purposes only.