The Economist is revoking premium digital subscriptions from some users after realizing it's been accidentally giving them full digital access -- for five years, in some cases. The magazine, which charges $110 a year for the digital-only subscription, tells freeloaders: “Unfortunately, we have been providing you with full digital access in error. Our system will be updated to correct this error on October 25th 2011. After that time, your full digital access will only continue if you choose to subscribe. ....We hope that you have enjoyed full digital access to The Economist. It would be our pleasure to welcome you as a subscriber in the near future."