The term open-sourcing is the act of releasing previously proprietary software under an open source/free software license.  Open-sourcing also refers to any program which the source is made available for modification as developers use to fit their needs.  Another term related to open-sourcing is Open Source. Open Source is a certification owned by the Open Source Initiative (OSI).  The purpose of the OSI is giving the developers of the software the ability to redistribute with the OSI trademark. Before the developers could redistribute with the OSI trademark, they must meet the requirements of the OSI.