Relax the EncryptMetadata check.

testing/resources/bug_644.pdf

Index: testing/resources/bug_644.pdf
diff --git a/testing/resources/bug_644.pdf b/testing/resources/bug_644.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..cfc4eda9d60eccdd4642c14943c933c08f48dfdc
--- /dev/null
+++ b/testing/resources/bug_644.pdf
@@ -0,0 +1,61 @@
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