Last month, we published something unusual for us: a long feature about the consumer electronics pioneer Psion. It's full of previously untold stories: the plucky outfit could have been the British Sony. But we know that reading long pieces on the web is a pain. So as promised, we're making it available as a PDF download.

Our technical wizards have been preparing for this moment for years and have devised the most sophisticated DRM technology ever attempted. Taking a cue from the music business, our USB dongle will spray a corrosive coating of hydrochloric acid over your PC - followed by a sarcastic sprinkling of chappati flour - if you attempt to so much as open the PDF.

This gets you a beautifully designed document that's optimised for reading on the train home, or in the bath - and contains exclusive material you won't find on the web version. Clickers will also be the first to hear about updates. Oh, and you get a free Epoc Word format version thrown in.

All for around the price of a pint of posh lager.

Happy reading.