This document summarizes legal and other issues related to the use of open source software. It defines key terms like proprietary software, open source software, and freeware. It discusses and compares licensing terms for proprietary vs open source software. It notes advantages and disadvantages of each for procurement purposes. It provides guidance on sharing software within the Commonwealth while complying with licensing terms. It emphasizes the importance of conducting best value procurement that considers technical, legal and business factors for both proprietary and open source options.