In the more than 16 years that I have been associated with EDIg all I have ever seen was NDA's used as an excuse for not telling us anything.  There is no safty in NDA's as far as I'm concerned.  what ever company they were associated with stole it all and used it and then the company hid behind some NDA.  Its a story that would make a good crime novel.  The only thing ab person would want to do in the dark is dance.