In a statement, the company said its original Patent Promise had stated that its patent portfolio was intended to to discourage patent aggression against free and open source software.
Under the expanded policy, the zone of non-enforcement has been expanded and now applies to "all of Red Hat’s patents, and all software licensed under well-recognised open source licences".
The original Patent Promise was issued in 2002. The new policy was said to be "substantially clearer and broader than its predecessor".
Michael Cunningham, executive vice-president and general counsel, Red Hat, said: "Red Hat’s Patent Promise now covers the lion’s share of open source code and continues to cover all of our patents.
"We encourage others to make commitments like these. The innovation machine represented by the open source community is an enormous positive force for society.
"Our patent promise – we believe the broadest in the industry – is intended to support and nurture that community and force.”