As the above methods (except RMS) adopt encryption technologies, they share the common limitation of encryption key storage and distribution. This limits their scale of deployment to only very small workgroups. However, RMS being a more sophisticated solution, beyond simple encryption, it provides the rights management of the file, i.e. who can access and how to limit the usage of the protected file.
What is the Rights Management (RMS) sharing application?
The Microsoft Rights Management (RMS) sharing application helps you keep important documents (Word, PDF, Excel, PowerPoint etc.) and pictures safe from people who shouldn't see them, even if the files are accidentally released to unauthorized persons. RMS leverages on identity-based encryption. This means ITSC username and password are used for encrypting and decrypting data. Users do not need to invent an arbitrary password each time when a file is required to be encrypted.