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---
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title: Room Version 5
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type: docs
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weight: 50
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---
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This room version builds on [version 4](/rooms/v4) while enforcing signing
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key validity periods for events.
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## Client considerations
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There are no client considerations introduced in this room version. Clients
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which implement the redaction algorithm locally should refer to the
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[redactions](#redactions) section below for a full overview of the algorithm.
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## Server implementation components
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{{% boxes/warning %}}
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The information contained in this section is strictly for server
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implementors. Applications which use the Client-Server API are generally
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unaffected by the intricacies contained here. The section above
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regarding client considerations is the resource that Client-Server API
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use cases should reference.
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{{% /boxes/warning %}}
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Room version 5 uses the same algorithms defined in [room version
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4](/rooms/v4), ensuring that signing key validity is respected.
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### Signing key validity period
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{{% rver-fragment name="v5-signing-requirements" %}}
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## Unchanged from v4
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The following sections have not been modified since v4, but are included for
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completeness.
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### State resolution
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{{% rver-fragment name="v2-state-res" %}}
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### Authorization rules
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{{% rver-fragment name="v3-auth-rules" %}}
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### Handling redactions
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{{% rver-fragment name="v3-handling-redactions" %}}
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### Event format
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{{% rver-fragment name="v4-event-explainer" %}}
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{{% definition path="api/server-server/definitions/pdu_v4" %}}
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### Canonical JSON
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{{% rver-fragment name="v1-canonical-json" %}}
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### Redactions
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{{% rver-fragment name="v1-redactions" %}}
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