diff --git a/poppler/Form.cc b/poppler/Form.cc
index d94757a..fa4fd32 100644
--- a/poppler/Form.cc
+++ b/poppler/Form.cc
@@ -1477,23 +1477,26 @@
     return signature_info;
   }
 
-  Object r2, r3, r4;
+  Object offset0, length0, offset1, length1;
   NSSCMSVerificationStatus sig_val_state;
   SECErrorCodes cert_val_state;
 
-  byte_range.arrayGet(1, &r2);
-  byte_range.arrayGet(2, &r3);
-  byte_range.arrayGet(3, &r4);
+  byte_range.arrayGet(0, &offset0);
+  byte_range.arrayGet(1, &length0);
+  byte_range.arrayGet(2, &offset1);
+  byte_range.arrayGet(3, &length1);
 
   Goffset fileLength = doc->getBaseStream()->getLength();
-  Goffset r_values[3];
+  Goffset r_offsets[2];
+  Goffset r_lengths[2];
 
-  r_values[0] = r2.isInt64() ? r2.getInt64() : r2.getInt();
-  r_values[1] = r3.isInt64() ? r3.getInt64() : r3.getInt();
-  r_values[2] = r4.isInt64() ? r4.getInt64() : r4.getInt();
+  r_offsets[0] = offset0.isInt64() ? offset0.getInt64() : offset0.getInt();
+  r_lengths[0] = length0.isInt64() ? length0.getInt64() : length0.getInt();
+  r_offsets[1] = offset1.isInt64() ? offset1.getInt64() : offset1.getInt();
+  r_lengths[1] = length1.isInt64() ? length1.getInt64() : length1.getInt();
 
-  if (r_values[0] <= 0 || r_values[1] <= 0 || r_values[2] <= 0 || r_values[1] <= r_values[0] ||
-    r_values[1] + r_values[2] > fileLength)
+  if (r_offsets[1] <= 0 || r_lengths[0] <= 0 || r_lengths[1] <= 0 || r_offsets[1] <= r_offsets[0]+r_lengths[0] ||
+    r_offsets[1] + r_lengths[1] > fileLength)
   {
       error(errSyntaxError, 0, "Illegal values in ByteRange array");
       return signature_info;
@@ -1506,18 +1509,21 @@
   SignatureHandler signature_handler(signatureuchar, signature_len);
 
   //Read the 2 slices of data that are signed
-  doc->getBaseStream()->setPos(0);
-  Goffset block_len = r_values[0];
+  doc->getBaseStream()->setPos(r_offsets[0]);
+  Goffset block_len = r_lengths[0];
 
   hashSignedDataBlock(&signature_handler, block_len);
 
-  doc->getBaseStream()->setPos(r_values[1]);
-  block_len = r_values[2];
+  doc->getBaseStream()->setPos(r_offsets[1]);
+  block_len = r_lengths[1];
 
   hashSignedDataBlock(&signature_handler, block_len);
 
   sig_val_state = signature_handler.validateSignature();
-  signature_info->setSignatureValStatus(SignatureHandler::NSS_SigTranslate(sig_val_state));
+  SignatureValidationStatus sig_status = SignatureHandler::NSS_SigTranslate(sig_val_state); 
+  if (sig_status == SIGNATURE_VALID && r_offsets[0] != 0)
+      sig_status = SIGNATURE_PARTLY_VALID;
+  signature_info->setSignatureValStatus(sig_status);
   signature_info->setSignerName(signature_handler.getSignerName());
 
   // verify if signature contains a 'signing time' attribute
diff --git a/poppler/SignatureInfo.h b/poppler/SignatureInfo.h
index 82b4ec4..66bfa88 100644
--- a/poppler/SignatureInfo.h
+++ b/poppler/SignatureInfo.h
@@ -18,6 +18,7 @@
 enum SignatureValidationStatus
 {
   SIGNATURE_VALID,
+  SIGNATURE_PARTLY_VALID,
   SIGNATURE_INVALID,
   SIGNATURE_DIGEST_MISMATCH,
   SIGNATURE_DECODING_ERROR,
diff --git a/utils/pdfsig.cc b/utils/pdfsig.cc
index 895876f..d77752e 100644
--- a/utils/pdfsig.cc
+++ b/utils/pdfsig.cc
@@ -33,6 +33,9 @@
   switch(sig_vs) {
     case SIGNATURE_VALID:
       return "Signature is Valid.";
+      
+    case SIGNATURE_PARTLY_VALID:
+      return "Signature is Valid but only covering a part of the document.";
 
     case SIGNATURE_INVALID:
       return "Signature is Invalid.";