Time is behind a paywall - so the magazine I created above actually had excerpts/summaries of the actual articles but did not offer the full article - this is an example of the kind of little frustrations you might encounter with Calibre. It isn't going to help you get a subscription for free if the online site requires authentication - and it isn't going to be a match for digital subscriptions that add enhanced or interactive features to their online editions. For what it offers to do, though - it is the best solution I've been able to find.