From 5092efe301210f53ff69c475543f02c95b0c254f Mon Sep 17 00:00:00 2001
From: eguven <eguven@google.com>
Date: Fri, 26 May 2017 03:03:48 -0700
Subject: [PATCH] Add a comment to record the reason for restoring licenses
 before releasing

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=157204373
---
 .../google/android/exoplayer2/drm/DefaultDrmSessionManager.java | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java b/library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java
index 6fc149ba32..cee174adbd 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java
@@ -513,6 +513,8 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
         }
         break;
       case MODE_RELEASE:
+        // It's not necessary to restore the key (and open a session to do that) before releasing it
+        // but this serves as a good sanity/fast-failure check.
         if (restoreKeys()) {
           postKeyRequest(offlineLicenseKeySetId, MediaDrm.KEY_TYPE_RELEASE);
         }