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Few days back, Apple won a patent for the "slide to unlock" gesture.
Apple had applied for the patent back in 2005, claiming the exclusive rights to unlocking a touchscreen device by tracing a preset pattern or gesture with a finger.
Here's a excerpt from the patent:
"a device with a touch-sensitive display may be unlocked via gestures performed on the touch-sensitive display. The device is unlocked if contact with the display corresponds to a predefined gesture for unlocking the device".