This is definitely not true. It’s even sometimes possible to negotiate contract and NDA terms with Large Corporations for the specific purpose of producing open source code based on NDA specs.
Source: been there, done that.
Why would they need an NDA then if they would be OK with open source implementation? It's good if that's possible, it just doesn't make sense.
Why would they need an NDA then if they would be OK with open source implementation? It's good if that's possible, it just doesn't make sense.