what is NDA

NDA stands for Non-Disclosure Agreement: Non-disclosure agreement Wikipedia

Typically you would sign a NDA as a contractor for a company when they want to restrict you from sharing information with competition or publically.

This is typically signed before commencement of the project and very rarely signed after the commencement of the project … although I have heard of this happening before.

So you answers are as follows:

  1. No - normally signed before commencement of work.
  2. Typically not, but the document when signed should be distributed in a printed format and all parties should get a signed copy.
  3. No, the NDA does not specify that. Typically this is what a contract is for.
  4. There would typically be an NDA between the contractor and the main company and you and the contractor.