The open source software (“OSS”) movement has been active for quite some time; some would track it back nearly thirty years with increasing popularity in the last decade or so. The movement has proponents and detractors who fuel debate of the relative benefits of OSS, while the prevalence of OSS remains and increases (e.g. many of the apps on an average smart phone have OSS). Per the eighth annual Future of Open Source Survey, published by Black Duck Software Inc., more than fifty percent of enterprises will contribute or adopt open source. It’s here to stay. This article discusses how legal practitioners working with software, whether internal or outside counsel, can help their clients who might use (or want to use) OSS.