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	docs: Document push notification redacting setting.
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		@@ -75,8 +75,8 @@ forwarding service).
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## Security and privacy implications
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We've designed this push notification bouncer service with security in
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mind:
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We've designed this push notification bouncer service with security
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and privacy in mind:
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* All of the network requests (both from Zulip servers to the Push
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  Notification Service and from the Push Notification Service to the
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@@ -85,10 +85,17 @@ mind:
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* The code for the push notification forwarding service is 100% open
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  source and available as part of the
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  [Zulip server project on GitHub](https://github.com/zulip/zulip).
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  The service's logging is designed to protect the privacy of users of
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  Zulip servers that are using the forwarding service.
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  The Push Notification Service is designed to avoid any message
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  content being stored or logged, even in error cases.
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* The push notification forwarding servers are professionally managed
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  by a small team.
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  by a small team of security experts.
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* There's a `PUSH_NOTIFICATION_REDACT_CONTENT` setting available to
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  disable any message content being sent via the push notification
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  bouncer (i.e. message content will be replaced with
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  `***REDACTED***`).  Note that this setting makes push notifications
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  significantly less usable.  We plan to
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  [replace this feature with end-to-end encryption](https://github.com/zulip/zulip/issues/6954)
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  which would eliminate that usability tradeoff.
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If you have any questions about the security model, contact
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support@zulipchat.com.
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