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123 lines
6.0 KiB
Markdown
123 lines
6.0 KiB
Markdown
# Stream privacy settings
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Streams are similar to chat rooms, IRC channels, or email lists in that they
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determine who receives a message. Zulip supports a few types of streams:
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* **Public** (<i class="zulip-icon zulip-icon-hashtag"></i>):
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Members can join and view the complete message history.
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Public streams are visible to guest users only if they are
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subscribed (exactly like private streams with shared history).
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* **Private** (<i class="zulip-icon zulip-icon-lock"></i>):
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New subscribers must be added by an existing subscriber. Only subscribers
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and organization administrators can see the stream's name and description,
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and only subscribers can view topics and messages with the stream:
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* In **private streams with shared history**, new subscribers can
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access the stream's full message history.
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* In **private streams with protected history**, new subscribers
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can only see messages sent after they join.
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* [**Web-public**](/help/public-access-option) (<i class="zulip-icon
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zulip-icon-globe"></i>): Members can join (guests must be invited by a
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subscriber). Anyone on the Internet can view complete message history without
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creating an account.
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## Privacy model for private streams
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At a high level:
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* Organization owners and administrators can see and modify most
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aspects of a private stream, including the membership and estimated
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traffic. Owners and administrators generally cannot see private
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stream messages or do things that would give them access to private
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stream messages, like adding new subscribers or changing the stream
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privacy settings.
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* [Organization members and moderators](/help/roles-and-permissions)
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cannot easily see which private streams exist, or interact with them
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in any way until they are added. Given a stream name, they can
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figure out whether a stream with that name exists, but cannot see
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any other details about the stream.
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* From the perspective of a guest, all streams are private streams,
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and they additionally can't add other members to the streams they
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are subscribed to.
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There are two situations in which an organization owner or
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administrator can access private stream messages:
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* Via some types of [data export](/help/export-your-organization).
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* Owners and administrators can change the ownership of a bot. If a
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bot is subscribed to a private stream, then an administrator can get
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access to that stream by taking control of the bot, though the
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access will be limited to what the bot can do. (E.g. incoming
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webhook bots cannot read messages.)
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## Detailed permissions
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### Public streams
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<div class="centered_table"></div>
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| | Owners and admins | Moderators | Members | Guests
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|--- |--- | |--- |---
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| View stream name | ✔ | ✔ | ✔ | ◾
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| Join | ✔ | ✔ | ✔ |
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| Unsubscribe | ◾ | ◾ | ◾ | ◾
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| Add others | ✔ | ✔ | ✔ |
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| Remove others | ✔ | ✶ | ✶ | ✶
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| See subscriber list | ✔ | ✔ | ✔ | ◾
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| See full history | ✔ | ✔ | ✔ | ◾
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| See estimated traffic | ✔ | ✔ | ✔ | ◾
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| Post | ✔ | ✶ | ✶ | ✶
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| Change the privacy | ✔ | | |
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| Rename | ✔ | | |
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| Edit the description | ✔ | | |
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| Delete | ✔ | | |
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<span class="legend_symbol">✔</span><span class="legend_label">Always</span>
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<span class="legend_symbol">◾</span><span class="legend_label">If subscribed to the stream</span>
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<span class="legend_symbol">✶</span><span class="legend_label">
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Configurable. See [Stream posting policy](/help/stream-sending-policy) and
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[Configure who can remove users](/help/add-or-remove-users-from-a-stream#configure-who-can-remove-users)
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for details.
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</span>
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### Private streams
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<div class="centered_table"></div>
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| | Owners and admins | Moderators | Members | Guests
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|--- |--- | |--- |---
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| View stream name | ✔ | ◾ | ◾ | ◾
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| Join | | | |
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| Unsubscribe | ◾ | ◾ | ◾ | ◾
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| Add others | ◾ | ◾ | ◾ |
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| Remove others | ✔ | ✶ | ✶ | ✶
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| See subscriber list | ✔ | ◾ | ◾ | ◾
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| See full history | ✶ | ✶ | ✶ | ✶
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| See estimated traffic | ✔ | ◾ | ◾ | ◾
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| Post | ◾ | ✶ | ✶ | ✶
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| Change the privacy | ◾ | | |
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| Rename | ✔ | | |
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| Edit the description | ✔ | | |
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| Delete | ✔ | | |
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<span class="legend_symbol">✔</span><span class="legend_label">Always</span>
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<span class="legend_symbol">◾</span><span class="legend_label">If subscribed to the stream</span>
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<span class="legend_symbol">✶</span><span class="legend_label">
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Configurable, but at minimum must be subscribed to the stream.
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See [Stream posting policy](/help/stream-sending-policy) and
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[Configure who can remove users](/help/add-or-remove-users-from-a-stream#configure-who-can-remove-users)
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for details.
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</span>
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## Related articles
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* [Roles and permissions](/help/roles-and-permissions)
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* [Stream sending policy](/help/stream-sending-policy)
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* [Web-public streams](/help/public-access-option)
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