Adobe Acrobat DC requires you to sign in in order to view and create PDFs. While I understand the logic behind that, if you do not have Internet access then you cannot use the app which makes it useless when traveling or when you are in an area that does not have access. This feature makes it impossible to make Acrobat DC as a standard app in our enterprise and will need to utilize a 3rd party app instead. Big loss in revenue for Adobe. I hope they can figure out a way that one you are logged in it keeps the credentials so if the Internet is lost then you can still use the product.