Groove Workspaces
Groove's core concept is the shared workspace, which consists of a set of files to be shared, plus some aids for group collaboration. Groove users can create workspaces, add documents, and invite other Groove members to a workspace. A user that responds to an invitation is made an active member of that workspace. Each member has a privately editable copy of the workspace. Users interact and collaborate in the common workspace which is a private virtual location. All changes are tracked by Groove, sent to all members and all copies of the workspace are synchronized via the network in a peer-to-peer manner or via a server.
When participating users are off-line, changes for their workspaces copies are queued, either on an Office Groove Server that mediates the workspace or via other participants (peer-to-peer), to be sent to users when they come on-line. When multiple users edit one document at the same time, changes may conflict and multiple versions will be shown until an editor decides which changes will become final.
Data are encrypted on disk with 192-bit AES encryption as well as over the network, with each workspace having a unique set of cryptographic keys.
Read more about this topic: Microsoft SharePoint Workspace