The private section is an extension of the functionality in the public section. The additional goals of the private tree are to maximize privacy, security, flexibility, and autonomy for users.
It adds an additional aspect of secrecy to the boundary between the data and file layers. private data is kept in a flat, scrambled tree, containing encrypted contents. A user that is allowed to decrypt a node in this structure is able to progressively discover the semantic file and directory structure contained in these nodes.