matrix-spec

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Upon receipt of a redaction event, the server must strip off any keys not in the following list:

The content object must also be stripped of all keys, unless it is one of the following event types:

m.room.member allows keys membership, join_authorised_via_users_server. Additionally, it allows the signed key of the third_party_invite key.
m.room.create allows all keys.
m.room.join_rules allows keys join_rule, allow.
m.room.power_levels allows keys ban, events, events_default, invite, kick, redact, state_default, users, users_default.
m.room.history_visibility allows key history_visibility.
m.room.redaction allows key redacts.