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diff --git a/src/applications/conpherence/controller/ConpherenceViewController.php b/src/applications/conpherence/controller/ConpherenceViewController.php
--- a/src/applications/conpherence/controller/ConpherenceViewController.php
+++ b/src/applications/conpherence/controller/ConpherenceViewController.php
@@ -147,9 +147,6 @@
$user = $this->getRequest()->getUser();
$participating = $conpherence->getParticipantIfExists($user->getPHID());
- if (!$participating && $user->isLoggedIn()) {
- return null;
- }
$draft = PhabricatorDraft::newFromUserAndKey(
$user,
$conpherence->getPHID());
diff --git a/src/applications/conpherence/editor/ConpherenceEditor.php b/src/applications/conpherence/editor/ConpherenceEditor.php
--- a/src/applications/conpherence/editor/ConpherenceEditor.php
+++ b/src/applications/conpherence/editor/ConpherenceEditor.php
@@ -341,13 +341,23 @@
$add = array_keys(array_diff_key($new_map, $old_map));
$rem = array_keys(array_diff_key($old_map, $new_map));
- $actor_phid = $this->requireActor()->getPHID();
-
- // You need CAN_EDIT to change participants other than yourself.
- PhabricatorPolicyFilter::requireCapability(
- $this->requireActor(),
- $object,
- PhabricatorPolicyCapability::CAN_EDIT);
+ $actor_phid = $this->getActingAsPHID();
+
+ $is_join = (($add === array($actor_phid)) && !$rem);
+ $is_leave = (($rem === array($actor_phid)) && !$add);
+
+ if ($is_join) {
+ // Anyone can join a thread they can see.
+ } else if ($is_leave) {
+ // Anyone can leave a thread.
+ } else {
+ // You need CAN_EDIT to add or remove participants. For additional
+ // discussion, see D17696 and T4411.
+ PhabricatorPolicyFilter::requireCapability(
+ $this->requireActor(),
+ $object,
+ PhabricatorPolicyCapability::CAN_EDIT);
+ }
break;
case ConpherenceThreadTitleTransaction::TRANSACTIONTYPE:

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