All Google Fonts are released under open source licenses. You can use them in any non-commercial or commercial project. But in some cases, it may require Google Fonts API Key to update the font list. If you have @gmail account login first, then go here: https://developers.google.com/fonts/docs/developer_api and find a blue button "Get a Key" and follow Google instructions. After you have an API key insert inside template options and click "One Click Update".