Can i show custom content only a user group

Question

How and is it possible to show a custom content (created with dexterity) only a user or user group?

Answer 1

1. Create a new Workflow (Probably copy an exsting Plone Workflow is easier).
2. Grand View permission only to one or more specific Roles, for example Reader and Manager. Also set acquire to False (checkbox)
3. Assign your new Workflow to your custom type in the portal_workflow tool.
4. Then create new instances of your custom contenttype.
5. Use the @@sharing view to add local roles to your user or user group.

By default a Plone user has the Member role on hole site. You can give now the Reader (Can add) role to a specific user or group on a specific context (instance of your custom type).