Complex sentence: The main difference between open-source and traditional proprietary software is in user and property rights, the conditions of use imposed on the user by the software license, as opposed to differences in the programming code.
Split into simpler sentences: The main difference between open source and traditional proprietary software is in the terms of user and property rights. These rights reside in the conditions of use that are imposed on the user by the license of the software, as opposed to a difference in the programming code.