diff --git a/fxjs/cjs_document.cpp b/fxjs/cjs_document.cpp
index a0bcf86..83e61eb 100644
--- a/fxjs/cjs_document.cpp
+++ b/fxjs/cjs_document.cpp
@@ -654,7 +654,8 @@
 
 CJS_Result CJS_Document::set_author(CJS_Runtime* pRuntime,
                                     v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "Author");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_info(CJS_Runtime* pRuntime) {
@@ -734,33 +735,14 @@
       pDictionary->GetUnicodeTextFor(propName).AsStringView()));
 }
 
-CJS_Result CJS_Document::setPropertyInternal(CJS_Runtime* pRuntime,
-                                             v8::Local<v8::Value> vp,
-                                             const ByteString& propName) {
-  if (!m_pFormFillEnv)
-    return CJS_Result::Failure(JSMessage::kBadObjectError);
-
-  CPDF_Dictionary* pDictionary = m_pFormFillEnv->GetPDFDocument()->GetInfo();
-  if (!pDictionary)
-    return CJS_Result::Failure(JSMessage::kBadObjectError);
-
-  using pdfium::access_permissions::kModifyContent;
-  if (!m_pFormFillEnv->HasPermissions(kModifyContent))
-    return CJS_Result::Failure(JSMessage::kPermissionError);
-
-  pDictionary->SetNewFor<CPDF_String>(
-      propName, pRuntime->ToWideString(vp).AsStringView());
-  m_pFormFillEnv->SetChangeMark();
-  return CJS_Result::Success();
-}
-
 CJS_Result CJS_Document::get_creation_date(CJS_Runtime* pRuntime) {
   return getPropertyInternal(pRuntime, "CreationDate");
 }
 
 CJS_Result CJS_Document::set_creation_date(CJS_Runtime* pRuntime,
                                            v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "CreationDate");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_creator(CJS_Runtime* pRuntime) {
@@ -769,7 +751,8 @@
 
 CJS_Result CJS_Document::set_creator(CJS_Runtime* pRuntime,
                                      v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "Creator");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_delay(CJS_Runtime* pRuntime) {
@@ -807,7 +790,8 @@
 
 CJS_Result CJS_Document::set_keywords(CJS_Runtime* pRuntime,
                                       v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "Keywords");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_mod_date(CJS_Runtime* pRuntime) {
@@ -816,7 +800,8 @@
 
 CJS_Result CJS_Document::set_mod_date(CJS_Runtime* pRuntime,
                                       v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "ModDate");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_producer(CJS_Runtime* pRuntime) {
@@ -825,7 +810,8 @@
 
 CJS_Result CJS_Document::set_producer(CJS_Runtime* pRuntime,
                                       v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "Producer");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_subject(CJS_Runtime* pRuntime) {
@@ -834,7 +820,8 @@
 
 CJS_Result CJS_Document::set_subject(CJS_Runtime* pRuntime,
                                      v8::Local<v8::Value> vp) {
-  return setPropertyInternal(pRuntime, vp, "Subject");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_title(CJS_Runtime* pRuntime) {
@@ -845,9 +832,8 @@
 
 CJS_Result CJS_Document::set_title(CJS_Runtime* pRuntime,
                                    v8::Local<v8::Value> vp) {
-  if (!m_pFormFillEnv)
-    return CJS_Result::Failure(JSMessage::kBadObjectError);
-  return setPropertyInternal(pRuntime, vp, "Title");
+  // Read-only.
+  return CJS_Result::Success();
 }
 
 CJS_Result CJS_Document::get_num_pages(CJS_Runtime* pRuntime) {
diff --git a/fxjs/cjs_document.h b/fxjs/cjs_document.h
index 860c5e9..789aa83 100644
--- a/fxjs/cjs_document.h
+++ b/fxjs/cjs_document.h
@@ -302,9 +302,6 @@
 
   CJS_Result getPropertyInternal(CJS_Runtime* pRuntime,
                                  const ByteString& propName);
-  CJS_Result setPropertyInternal(CJS_Runtime* pRuntime,
-                                 v8::Local<v8::Value> vp,
-                                 const ByteString& propName);
 
   CPDF_InteractiveForm* GetCoreInteractiveForm();
   CPDFSDK_InteractiveForm* GetSDKInteractiveForm();
diff --git a/testing/resources/javascript/document_properties_expected.txt b/testing/resources/javascript/document_properties_expected.txt
index 5bab82f..ba89da0 100644
--- a/testing/resources/javascript/document_properties_expected.txt
+++ b/testing/resources/javascript/document_properties_expected.txt
@@ -237,13 +237,13 @@
 Alert: this.zoomType = 3; yields 3
 Alert: *** Getting properties ***
 Alert: this.ADBE is undefined undefined
-Alert: this.author is string 3
+Alert: this.author is string Joe Random Author
 Alert: this.baseURL is string 3
 Alert: this.bookmarkRoot is undefined undefined
 Alert: this.calculate is boolean true
 Alert: this.Collab is undefined undefined
-Alert: this.creationDate is string 3
-Alert: this.creator is string 3
+Alert: this.creationDate is string 
+Alert: this.creator is string Joe Random Creator
 Alert: this.delay is boolean true
 Alert: this.dirty is boolean true
 Alert: this.documentFileName is string 
@@ -251,10 +251,10 @@
 Alert: this.filesize is number 0
 Alert: this.icons is undefined undefined
 Alert: this.info is object [object Object]
-Alert: this.keywords is string 3
+Alert: this.keywords is string 
 Alert: this.layout is undefined undefined
 Alert: this.media is undefined undefined
-Alert: this.modDate is string 3
+Alert: this.modDate is string 
 Alert: this.mouseX is undefined undefined
 Alert: this.mouseY is undefined undefined
 Alert: this.numFields is number 0
@@ -262,9 +262,9 @@
 Alert: this.pageNum is undefined undefined
 Alert: this.pageWindowRect is undefined undefined
 Alert: this.path is string /myfile.pdf
-Alert: this.producer is string 3
-Alert: this.subject is string 3
-Alert: this.title is string 3
+Alert: this.producer is string 
+Alert: this.subject is string 
+Alert: this.title is string 
 Alert: this.URL is string myfile.pdf
 Alert: this.zoom is undefined undefined
 Alert: this.zoomType is undefined undefined