Adobe have released the new version of Acrobat Reader with Web Buy built in. This allows you to purchase keys to unlock encrypted PDF files online. They've made a number of free out-of-copyright books available for download to trial the technology. Not sure how I feel about this. I think I'd be happier if I had more of a choice of client rather than being tied to Adobe. Any kind of vendor lock in makes me nervous, and giving their software away makes me even more nervous, after all these companies aren't in the business of altrusim, they're in the business of making money.