diff --git a/include/xmlsecurity/pdfio/pdfdocument.hxx b/include/xmlsecurity/pdfio/pdfdocument.hxx
index 5f64b650ed17..f5179fd4af6d 100644
--- a/include/xmlsecurity/pdfio/pdfdocument.hxx
+++ b/include/xmlsecurity/pdfio/pdfdocument.hxx
@@ -254,8 +254,6 @@ class XMLSECURITY_DLLPUBLIC PDFDocument
     SvMemoryStream m_aEditBuffer;
 
     static int AsHex(char ch);
-    /// Decode a hex dump.
-    static std::vector<unsigned char> DecodeHexString(PDFHexStringElement* pElement);
     /// Suggest a minimal, yet free signature ID to use for the next signature.
     sal_uInt32 GetNextSignature();
     /// Write the signature object as part of signing.
@@ -277,6 +275,8 @@ public:
     PDFDocument(const PDFDocument&) = delete;
     /// @name Low-level functions, to be used by PDFElement subclasses.
     //@{
+    /// Decode a hex dump.
+    static std::vector<unsigned char> DecodeHexString(PDFHexStringElement* pElement);
     static OString ReadKeyword(SvStream& rStream);
     static size_t FindStartXRef(SvStream& rStream);
     void ReadXRef(SvStream& rStream);
@@ -309,17 +309,18 @@ public:
     bool Write(SvStream& rStream);
     /// Get a list of signatures embedded into this document.
     std::vector<PDFObjectElement*> GetSignatureWidgets();
-    /**
-     * @param rInformation The actual result.
-     * @param bLast If this is the last signature in the file, so it covers the whole file physically.
-     * @return If we can determinate a result.
-     */
-    static bool ValidateSignature(SvStream& rStream, PDFObjectElement* pSignature, SignatureInformation& rInformation, bool bLast);
     /// Remove the nth signature from read document in the edit buffer.
     bool RemoveSignature(size_t nPosition);
     //@}
 };
 
+/**
+ * @param rInformation The actual result.
+ * @param bLast If this is the last signature in the file, so it covers the whole file physically.
+ * @return If we can determinate a result.
+ */
+XMLSECURITY_DLLPUBLIC bool ValidateSignature(SvStream& rStream, PDFObjectElement* pSignature, SignatureInformation& rInformation, bool bLast);
+
 } // namespace pdfio
 } // namespace xmlsecurity
 
diff --git a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
index ca17aa29faa8..8d572ea6b53d 100644
--- a/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
+++ b/xmlsecurity/qa/unit/pdfsigning/pdfsigning.cxx
@@ -131,7 +131,7 @@ std::vector<SignatureInformation> PDFSigningTest::verify(const OUString& rURL, s
     {
         SignatureInformation aInfo(i);
         bool bLast = i == aSignatures.size() - 1;
-        CPPUNIT_ASSERT(xmlsecurity::pdfio::PDFDocument::ValidateSignature(aStream, aSignatures[i], aInfo, bLast));
+        CPPUNIT_ASSERT(xmlsecurity::pdfio::ValidateSignature(aStream, aSignatures[i], aInfo, bLast));
         aRet.push_back(aInfo);
 
         if (!rExpectedSubFilter.isEmpty())
@@ -233,7 +233,7 @@ void PDFSigningTest::testPDFRemove()
         std::vector<xmlsecurity::pdfio::PDFObjectElement*> aSignatures = aDocument.GetSignatureWidgets();
         CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(1), aSignatures.size());
         SignatureInformation aInfo(0);
-        CPPUNIT_ASSERT(xmlsecurity::pdfio::PDFDocument::ValidateSignature(aStream, aSignatures[0], aInfo, /*bLast=*/true));
+        CPPUNIT_ASSERT(xmlsecurity::pdfio::ValidateSignature(aStream, aSignatures[0], aInfo, /*bLast=*/true));
     }
 
     // Remove the signature and write out the result as remove.pdf.
diff --git a/xmlsecurity/source/helper/pdfsignaturehelper.cxx b/xmlsecurity/source/helper/pdfsignaturehelper.cxx
index 18bf89e7f1a2..d97d76c52adc 100644
--- a/xmlsecurity/source/helper/pdfsignaturehelper.cxx
+++ b/xmlsecurity/source/helper/pdfsignaturehelper.cxx
@@ -53,7 +53,7 @@ bool PDFSignatureHelper::ReadAndVerifySignature(const uno::Reference<io::XInputS
         SignatureInformation aInfo(i);
 
         bool bLast = i == aSignatures.size() - 1;
-        if (!xmlsecurity::pdfio::PDFDocument::ValidateSignature(*pStream, aSignatures[i], aInfo, bLast))
+        if (!xmlsecurity::pdfio::ValidateSignature(*pStream, aSignatures[i], aInfo, bLast))
             SAL_WARN("xmlsecurity.helper", "failed to determine digest match");
 
         m_aSignatureInfos.push_back(aInfo);
diff --git a/xmlsecurity/source/pdfio/pdfdocument.cxx b/xmlsecurity/source/pdfio/pdfdocument.cxx
index dd63c2395634..209b6df3dbe2 100644
--- a/xmlsecurity/source/pdfio/pdfdocument.cxx
+++ b/xmlsecurity/source/pdfio/pdfdocument.cxx
@@ -2157,7 +2157,7 @@ bool VerifyNonDetachedSignature(SvStream& rStream, std::vector<std::pair<size_t,
 #endif
 }
 
-bool PDFDocument::ValidateSignature(SvStream& rStream, PDFObjectElement* pSignature, SignatureInformation& rInformation, bool bLast)
+bool ValidateSignature(SvStream& rStream, PDFObjectElement* pSignature, SignatureInformation& rInformation, bool bLast)
 {
     PDFObjectElement* pValue = pSignature->LookupObject("V");
     if (!pValue)
diff --git a/xmlsecurity/workben/pdfverify.cxx b/xmlsecurity/workben/pdfverify.cxx
index 5e19601ea284..2b43c1ef3137 100644
--- a/xmlsecurity/workben/pdfverify.cxx
+++ b/xmlsecurity/workben/pdfverify.cxx
@@ -224,7 +224,7 @@ int pdfVerify(int nArgc, char** pArgv)
             {
                 SignatureInformation aInfo(i);
                 bool bLast = i == aSignatures.size() - 1;
-                if (!xmlsecurity::pdfio::PDFDocument::ValidateSignature(aStream, aSignatures[i], aInfo, bLast))
+                if (!xmlsecurity::pdfio::ValidateSignature(aStream, aSignatures[i], aInfo, bLast))
                 {
                     SAL_WARN("xmlsecurity.pdfio", "failed to determine digest match");
                     return 1;