From 04840dd2b5ee9481547a08e33ea846ded6c2c31b Mon Sep 17 00:00:00 2001
From: Horst Rutter <hhrutter@gmail.com>
Date: Tue, 12 Sep 2023 10:17:52 +0200
Subject: [PATCH] Fix #708

---
 pkg/pdfcpu/validate/extGState.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkg/pdfcpu/validate/extGState.go b/pkg/pdfcpu/validate/extGState.go
index 7bbf078c9..bc25788f3 100644
--- a/pkg/pdfcpu/validate/extGState.go
+++ b/pkg/pdfcpu/validate/extGState.go
@@ -950,7 +950,11 @@ func validateExtGStateDictPart3(xRefTable *model.XRefTable, d types.Dict, dictNa
 	}
 
 	// TK, boolean, optional, since V1.4, text knockout flag.
-	_, err = validateBooleanEntry(xRefTable, d, dictName, "TK", OPTIONAL, model.V14, nil)
+	sinceVersion = model.V14
+	if xRefTable.ValidationMode == model.ValidationRelaxed {
+		sinceVersion = model.V13
+	}
+	_, err = validateBooleanEntry(xRefTable, d, dictName, "TK", OPTIONAL, sinceVersion, nil)
 
 	return err
 }