Work Smart: SharePoint Online: Keep your Files Secure in the Cloud

How to restrict access to your site through permissions setting and applying Information Rights Management to files. Work Smart brings tips/tricks from Microsoft IT that improve digital productivity and help create an all-digital culture within Microsoft.

https://channel9.msdn.com/Blogs/Microsoft-IT-Showcase/Work-Smart-SharePoint-Online-Keep-your-Files-Secure-in-the-Cloud