This is about configurable access privilegs by the means of users, groups, roles, and access control lists (ACLs). Access control might be an issue with shared DeepaMehta installations.
The Access Control plugin is part of the recent DeepaMehta 3 v0.4.3 release but is deactivated by default.
WARNING: This plugin is in early state and not yet ready for production use. Do not activate the plugin on a DeepaMehta 3 installation that holds your real content. Although you would not loose any data your installation might not properly upgrade to later versions of the DeepaMehta 3 Access Control plugin.
Activation instructions and usage hints:
https://github.com/jri/deepamehta3-accesscontrol
The Access Control plugin is planed to be ready for production use in DeepaMehta v0.5, January 2011.
Cheers,
Jörg