Creative Commons is an organization dedicated to making the sharing of materials easier and providing an alternative to traditional copyright. Creative Commons has a set of licenses that people can put on their creative works that clearly communicate with others what rights they have with respect to those works.
The creative works on our site are license with a Creative Commons CC BY-NC-SA (Attribution-NonCommercial-ShareAlike) license. This means that you can use and modify these materials as long as you attribute the original author, don’t use them for commercial purposes, and also share with others the work that you created from the materials. You can find more details about this license here in English and in Russian. You can learn how to modify H5P activities by visiting the page Using H5P activities.