GitHub now lets its workers keep the IP when they use company resources for personal projects

Found on Quartz on Tuesday, 21 March 2017
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This allows its employees to use company equipment to work on personal projects in their free time, which can occur during work hours, without fear of being sued for the IP.

GitHub’s new agreement doesn’t explicitly state that employees can use company time to develop their own IP, but does say employees can own any work they produce in their “free time.”

Or, you could just not tell your employer what you are working on in your free time, and keep any source outside their control.