diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
index 2ca3cdf..b45b9c8 100644
--- a/Source/WebKit/ChangeLog
+++ b/Source/WebKit/ChangeLog
@@ -1,3 +1,20 @@
+2018-04-30  Andy Estes  <aestes@apple.com>
+
+        [iOS] Try to unlock PDF documents before printing them
+        https://bugs.webkit.org/show_bug.cgi?id=185084
+        <rdar://problem/39356622>
+
+        Reviewed by Dan Bernstein.
+
+        * UIProcess/ios/WKPDFView.mm:
+        (-[WKPDFView pdfHostViewController:documentDidUnlockWithPassword:]):
+
+        Stored the password that successfully unlocked the current PDF document.
+
+        (-[WKPDFView _wk_printedDocument]):
+
+        Used the stored password to unlock the CGPDFDocument we create for printing.
+
 2018-04-28  Andy Estes  <aestes@apple.com>
 
         [iOS] Present an action sheet when long-pressing on PDF links
diff --git a/Source/WebKit/UIProcess/ios/WKPDFView.mm b/Source/WebKit/UIProcess/ios/WKPDFView.mm
index 2a0c100..5cbe8ce 100644
--- a/Source/WebKit/UIProcess/ios/WKPDFView.mm
+++ b/Source/WebKit/UIProcess/ios/WKPDFView.mm
@@ -57,6 +57,7 @@
     RetainPtr<PDFHostViewController> _hostViewController;
     CGSize _overlaidAccessoryViewsInset;
     RetainPtr<UIView> _pageNumberIndicator;
+    RetainPtr<NSString> _password;
     WebKit::InteractionInformationAtPosition _positionInformation;
     RetainPtr<NSString> _suggestedFilename;
     WebKit::WeakObjCPtr<WKWebView> _webView;
@@ -359,6 +360,11 @@
     [self _scrollToURLFragment:[_webView URL].fragment];
 }
 
+- (void)pdfHostViewController:(PDFHostViewController *)controller documentDidUnlockWithPassword:(NSString *)password
+{
+    _password = adoptNS([password copy]);
+}
+
 - (void)pdfHostViewController:(PDFHostViewController *)controller findStringUpdate:(NSUInteger)numFound done:(BOOL)done
 {
     // FIXME: We should stop searching once numFound exceeds _findStringMaxCount, but PDFKit doesn't
@@ -498,7 +504,10 @@
 - (CGPDFDocumentRef)_wk_printedDocument
 {
     auto dataProvider = adoptCF(CGDataProviderCreateWithCFData((CFDataRef)_data.get()));
-    return adoptCF(CGPDFDocumentCreateWithProvider(dataProvider.get())).autorelease();
+    auto pdfDocument = adoptCF(CGPDFDocumentCreateWithProvider(dataProvider.get()));
+    if (!CGPDFDocumentIsUnlocked(pdfDocument.get()))
+        CGPDFDocumentUnlockWithPassword(pdfDocument.get(), [_password UTF8String]);
+    return pdfDocument.autorelease();
 }
 
 @end