The Johns Hopkins University Open Source Programs Office (OSPO) is happy to announce the next installment in our Explainer series, a collection of bite-sized videos tackling a variety of open-source essentials. 

 This explainer video dives into the world of open-source licenses. You’ll learn what open-source software is and why licenses are important. The video explores the two main types of licenses (copyleft and permissive) and how to choose the right one for your project. It also clarifies the difference between open-source and source-available licenses and concludes with tips on how to properly license your code. 

Look out later this summer for Explainers about READMEs and Citing Research Software.  

Have an idea for an Explainer? We’d love to hear it! Please reach out to

View the complete OSPO Explainer Library at