---
type: concept
title: Calendar Permissions
created: 2026-07-01
updated: 2026-07-01
tags: [privacy, access-control, groupware]
related: [groupware-calendar]
sources: ["output/rz_uni_greifswald_de_dienste_webdienste_groupware_module_kalender.md"]
---

# Calendar Permissions

**Calendar Permissions** in the university Groupware system define how personal and shared schedules are accessed by other users.

## Permission Model
The system utilizes an explicit grant model to ensure data privacy:
- **Privacy by Default**: By default, no shares are active. A user's calendar is private until they take action to share it.
- **Access Levels**: Permissions can be granted as either **read-only** (viewing appointments) or **write-access** (editing appointments).
- **Availability Sharing**: Even basic availability (whether a user is free or busy) is not public by default and requires explicit activation in the settings.
