“Yes, your project needs a license.” Licenses are the foundation of the free, open source world we know today. Yet developers often try to avoid licenses and treat them more like an infectious disease than something that might actually be useful. This talk strives to provide an overview of the hows and whys of open source licensing as well as providing some tools and knowledge to make dealing with “the legal stuff” a lot easier. Without the need of becoming an actual lawyer, one can thus already avoid a lot of issues for developers and users alike. Developers often do not care much about licenses and try to avoid dealing with them. Yet these licenses are the foundation of the free, open source world we know today and without them development itself would actually be a lot harder as well. This general reluctance to deal with licenses can sometimes end up in problematic situations for both developers and users and may even unintentionally render projects useless. With a few resources and some general knowledge, however, dealing with the basics may even become easy. This talk will explore the following topics: “I am not a lawyer”, what I can do as a developer. Why do I need a license anyway? Don't do that! Custom licenses and other bad ideas. Best practices. Resources and tools that make your life easier.