This should be interesting...
Is Slashdot REALLY the place you think you'll get the best advice on this topic? I expect you're mostly going to hear from people who expect everything available for free.
In any case - do you know for sure piracy is causing significant issues for you? Just because something IS available on torrent sites doesn't mean that's where everyone who was a print subscriber is getting it now. I tend to believe a lot of people that download torrented stuff are only doing so because it's available for free - they have zero interest in buying it, and in the old days would never have been one of your print subscribers.
iTunes manages to sell a lot of music without protecting it at all, for example. Maybe you're thinking about it backwards - rather than focussing on making it hard to get at your content, instead think "how can we deliver this content in a compelling, visually interesting, easy to navigate way? People who were inclined to pay for "print" may very well be inclined to pay for continued access to that expertise, if they feel they're getting their money's worth.