.RMS files are files that have been stored in a secure media format that allows a variety of different media formats to be encoded into one single secure container. .RMS files are similar to a standard Real Media (.RM) file, but the.RMS file will support digital rights management (DRM) . DRM is a technology which prevents the file from being played on unauthorized computers or devices. .RMS files are commonly created using the Helix DRM Packager, which generates a globally unique identifier (GUID), as well as a key for the secured file.