Signed in does not mean what we think. It is a license authenticator. If you login to start Acrobat DC it will of course start when you log in as requested. But once you have done this you can shut down your machine and restart without a network connection and Acrobat will still be fully functional. It is the act of logging out from acrobat that apparently forces the license request. So as long as you don't intentionally logout of the app it will work without a network connection and therefore is NOT actually connected to the network. I cannot say that if you are reconnected to a network that it is not reseablishing a connection without a request to you. I discoverd this through experimentation. As commented by others here it may periodically require a connection to refresh a use timer. This does not imply that the system when it does require a connection is not transferring data to ADOBE that is sensitive to your organization and therefore you must determine the level of risk. I am continuing to examine how long the license will operate without a refresh of the authentication. This is the first observed method I have done that allows us to operate in a non-connected environment such as aircraft or secure facility.