diff --git a/sign.go b/sign.go
index f6495f5..de4a4f4 100644
--- a/sign.go
+++ b/sign.go
@@ -124,7 +124,7 @@ func main() {
 					Date:        time.Now().Local(),
 				},
 				CertType:   sign.CertificationSignature,
-				DocMDPPerm: sign.AllowFillingExistingFormFieldsAndSignatures,
+				DocMDPPerm: sign.AllowFillingExistingFormFieldsAndSignaturesPerms,
 			},
 			Signer:            pkey,
 			Certificate:       cert,
diff --git a/sign/pdfinfo_test.go b/sign/pdfinfo_test.go
index b9cb560..9b577f4 100644
--- a/sign/pdfinfo_test.go
+++ b/sign/pdfinfo_test.go
@@ -39,7 +39,7 @@ func TestCreateInfoEmpty(t *testing.T) {
 				Date:        time.Now().Local(),
 			},
 			CertType:   CertificationSignature,
-			DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+			DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 		},
 	}
 
@@ -103,7 +103,7 @@ func TestCreateInfo(t *testing.T) {
 				Date:        time.Now().Local(),
 			},
 			CertType:   CertificationSignature,
-			DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+			DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 		},
 	}
 
diff --git a/sign/pdfsignature_test.go b/sign/pdfsignature_test.go
index 5a569f2..6f45937 100644
--- a/sign/pdfsignature_test.go
+++ b/sign/pdfsignature_test.go
@@ -41,7 +41,7 @@ func TestCreateSignature(t *testing.T) {
 				Date:        now,
 			},
 			CertType:   CertificationSignature,
-			DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+			DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 		},
 	}
 
diff --git a/sign/pdfvisualsignature_test.go b/sign/pdfvisualsignature_test.go
index f7b1b01..5395a2c 100644
--- a/sign/pdfvisualsignature_test.go
+++ b/sign/pdfvisualsignature_test.go
@@ -41,7 +41,7 @@ func TestVisualSignature(t *testing.T) {
 				Date:        now,
 			},
 			CertType:   CertificationSignature,
-			DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+			DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 		},
 	}
 
diff --git a/sign/sign.go b/sign/sign.go
index b445197..a81aa3e 100644
--- a/sign/sign.go
+++ b/sign/sign.go
@@ -63,8 +63,8 @@ const (
 
 const (
 	DoNotAllowAnyChangesPerms = iota + 1
-	AllowFillingExistingFormFieldsAndSignatures
-	AllowFillingExistingFormFieldsAndSignaturesAndCRUDAnnotations
+	AllowFillingExistingFormFieldsAndSignaturesPerms
+	AllowFillingExistingFormFieldsAndSignaturesAndCRUDAnnotationsPerms
 )
 
 type SignDataSignatureInfo struct {
diff --git a/sign/sign_test.go b/sign/sign_test.go
index 03ac50a..ca69046 100644
--- a/sign/sign_test.go
+++ b/sign/sign_test.go
@@ -181,7 +181,7 @@ func TestSignPDF(t *testing.T) {
 						Date:        time.Now().Local(),
 					},
 					CertType:   CertificationSignature,
-					DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+					DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 				},
 				Signer:            pkey,
 				Certificate:       cert,
@@ -254,7 +254,7 @@ func TestSignPDFFile(t *testing.T) {
 				Date:        time.Now().Local(),
 			},
 			CertType:   CertificationSignature,
-			DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+			DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 		},
 		Signer:            pkey,
 		Certificate:       cert,
@@ -333,7 +333,7 @@ func BenchmarkSignPDF(b *testing.B) {
 					Date:        time.Now().Local(),
 				},
 				CertType:   CertificationSignature,
-				DocMDPPerm: AllowFillingExistingFormFieldsAndSignatures,
+				DocMDPPerm: AllowFillingExistingFormFieldsAndSignaturesPerms,
 			},
 			Signer:            pkey,
 			Certificate:       cert,