intellitech writes: According to the Social Apples blog, iPhones and iPads running the latest iOS firmware contain a “jailbreak check” that automatically detects when the devices have been unlocked using the greenpois0n jailbreak kit. Jailbroken devices that attempt to load content using the iBooks application – even legally acquired e-books – display an error message that reads: “There is a problem with the configuration of your iPhone. Please restore with iTunes and reinstall iBooks.” Link to Original Source
I've never been canoeing before, but I imagine there must be just a few
simple heuristics you have to remember...
Yes, don't fall out, and don't hit rocks.