It's a simple idea: When an unlock slider appears on the screen, swipe your finger to the right to unlock your device. But it could make things very difficult for developers working in platforms, such as Android, that compete with Apple devices, like the iPhone, iPod and iPad. The so-called swipe-to-unlock idea officially became the intellectual property of Apple this week when the U.S. Patent Office approved the company's patent for "unlocking a device by performing gestures on an unlock image."
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