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Freemium (coined in 2006 by Fred Wilson) is a pricing strategy by which a product or service (typically a digital offering or application such as software, media, games or web services) is provided free of charge, but money (premium) is charged for proprietary features, functionality, or virtual goods.  — Wikipedia

But

http://www.saasmarketingstrategy.com/saas-advice-blog/2012/02/free-trials-dont-always-make-sense.html