DDB products come as part of the web site, not as PDFs. You can of course print the page out, but it's designed to be viewed live. Personally, I find this to be much better than PDF, because as a reasonably well-designed web site it adapts to whatever screen I am using, whether that is my big desktop screen, my iPad screen, or my phone screen. It also means it can be used as a proper web site with hyperlinks that can open up in new tabs, which makes it a lot easier to keep tracks of various monsters and spells and things like that. But tastes vary.
Your subscription, if any, is separate from the products you have bought there, and have more to do with your access to the various tools on the site. So you can have a free account on the site and still have access to the things you bought, but there will probably be ads on the page, and you'll be limited in how to use the character creator and things like that.