This document discusses open source code and software issues related to intellectual property rights. It begins with an introduction to open source code, noting that it allows free access to source code and the ability to improve and redistribute derivative works, subject to certain licensing terms. It then discusses characteristics of open source, including how the copyleft movement uses copyright to keep software free. Next, it examines intellectual property rights as they relate to source code, including copyright, patents, trademarks and moral rights. It also discusses issues around licensing, ownership and international implications. Overall, the document provides a comprehensive overview of open source code and the intellectual property considerations that accompany it.