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matrix-spec/specification/modules/history_visibility.rst

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Room History Visibility
-----------------------
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Whether a member of a room can see the events that happened in a room from
before they joined the room is controlled by the ``history_visibility`` key
of the ``m.room.history_visibility`` state event. The valid values for
``history_visibility`` are:
- ``shared``
- ``invited``
- ``joined``
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By default if no ``history_visibility`` is set it is assumed to be ``shared``.
The rules governing whether a user is allowed to see an event depend solely on
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the state of the room at that event:
1. If the user was joined, allow.
2. If the user was invited and the ``history_visibility`` was set to
``invited`` or ``shared``, allow.
3. If the user was neither invited nor joined but the ``history_visibility``
was set to ``shared``, allow.
4. Otherwise, deny.