I don't understand how Optimizely (https://www.optimizely.com/) and VWO (https://www.vwo.com/) exist after seeing an A/B testing patent here:
http://www.google.com/patents/US7975000
Also what about this: A personal emergency system via a mobile device called Emergensee (http://emergensee.com/). They have patented this method and technology here:
Does this restrict me from making another one with a slight difference? Or what can/can't I do? Can I make an open source version and put it for free on app market?