mirror of https://github.com/zulip/zulip.git
103 lines
4.2 KiB
Markdown
103 lines
4.2 KiB
Markdown
# Stream privacy settings
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Streams are similar to chatrooms, IRC channels, or email lists in that they
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determine who receives a message. There are three types of streams in Zulip.
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* **Public**: Anyone other than guests can join, and anyone (other
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than guests) can view the complete message history without joining.
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* **Private, shared history**: You must be added by a member of the stream. The
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complete message history is available as soon as you are added.
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* **Private, protected history**: You must be added by a member of the
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stream. You only have access to the messages that are sent after you are added.
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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](/help/roles-and-permissions) cannot easily
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see which private streams exist, or interact with them in any way
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until they are added. Given a stream name, they can figure out
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whether a stream with that name exists, but cannot see any other
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details about the stream.
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* From the perspective of a guest, all streams are private streams, and they
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additionally can't add other members to the streams they 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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| | Owners and admins | Members | Guests
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|--- |--- |--- |---
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| Join | ✔ | ✔ |
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| Unsubscribe | ◾ | ◾ | ◾
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| Add 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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| Remove others | ✔ | |
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| Delete | ✔ | |
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✔ Always
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◾ If subscribed to the stream
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✶ [Configurable](/help/stream-sending-policy). Owners,
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Administrators, and Members can, by default, post to any public
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stream, and Guests can only post to public streams if they are
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subscribed.
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### Private streams
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| | Owners and admins | Members | Guests
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|--- |--- |--- |---
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| Join | | |
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| Unsubscribe | ◾ | ◾ | ◾
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| Add 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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| Remove others | ✔ | |
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| Delete | ✔ | |
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✔ Always
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◾ If subscribed to the stream
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✶ [Configurable](/help/stream-sending-policy), but at minimum
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must be subscribed to the stream.
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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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