Every now and then an entrepreneur will ask us for an NDA. We do not like signing them and we very rarely do (and never in the beginning of a discussion). We have signed a few in the past and it always had only one effect: it slowed down the discussion between us and the startup.
Below you will find a very quick summary of why I do not think NDAs between startups and VCs are a good idea. Instead of going into the details of each of the points, I will post a list of good blog posts around these topics, since so much has been written about NDAs already. I will aim to expand this list and add new interesting posts as I come across them. Then, I will just send a link to this post to the next startup founder asking for an NDA.
Why NDAs are not a good idea (summary):
- impossible to manage for the VC
 - slow down the discussion between startup and VC
 - signal lack of trust in the beginning of a relationship
 - in practice do not provide protection anyway
 - execution of an idea and the team around it is so much more important and defensible than the idea itself
 
Selected blog posts on the topic of NDAs:
- http://www.bothsidesofthetable.com/2009/07/26/on-ndas-and-confidentiality/
 - 
http://startuplawyer.com/venture-capital/why-a-vc-will-take-a-lighter-to-your-nda
 - 
http://www.feld.com/archives/2006/02/why-most-vcs-dont-sign-ndas.html
 - http://avc.com/2006/02/why_vcs_dont_si/
 - 
http://www.entrepreneur.com/article/245023
 - 
http://www.forbes.com/sites/ericwagner/2013/07/09/in-search-of-funding-7-core-principles-to-raise-capital/
 
Please let me know if you have any comments or additions to the above lists.