Apple's operating systems: Fortresses or prisons?

Many of the same capabilities that make Apple's iOS and Mac OS X operating systems secure are those that close the platform in some way.

Source: http://www.infoworld.com/t/mac-os-x/apples-operating-systems-fortresses-or-prisons-194412?source=rss_infoworld_top_stories_

ACCENTURE ACER ADOBE SYSTEMS ADVANCED SEMICONDUCTOR ENGINEERING ALLIANCE DATA SYSTEMS