diff --git a/packages/vitec/Classes/DataProcessing/HiddenHeaderProcessor.php b/packages/vitec/Classes/DataProcessing/HiddenHeaderProcessor.php
new file mode 100644
index 0000000..b7ad67f
--- /dev/null
+++ b/packages/vitec/Classes/DataProcessing/HiddenHeaderProcessor.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Evomedien\Vitec\DataProcessing;
+
+use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
+use TYPO3\CMS\Frontend\ContentObject\DataProcessorInterface;
+
+/**
+ * header_layout 100 = "Hidden": blank the header fields in the content-blocks
+ * JSON (`data`, produced by nb-content-blocks-json in step 10 of
+ * lib.contentBlock). The layout value itself stays in the payload so the
+ * front end can still tell why the header is empty. Counterpart of the
+ * stdWrap.if rule on lib.contentElementWithHeader / the container elements
+ * (see Sets/Vitecset/setup.typoscript, decision 2026-09-04).
+ */
+final class HiddenHeaderProcessor implements DataProcessorInterface
+{
+    public function process(
+        ContentObjectRenderer $cObj,
+        array $contentObjectConfiguration,
+        array $processorConfiguration,
+        array $processedData
+    ): array {
+        $data = $processedData['data'] ?? null;
+        if (is_array($data) && (int)($data['header_layout'] ?? 0) === 100) {
+            foreach (['header', 'subheader', 'header_link'] as $key) {
+                if (isset($data[$key]) && $data[$key] !== '') {
+                    $data[$key] = '';
+                }
+            }
+            $processedData['data'] = $data;
+        }
+        return $processedData;
+    }
+}
diff --git a/packages/vitec/Configuration/Sets/Vitecset/setup.typoscript b/packages/vitec/Configuration/Sets/Vitecset/setup.typoscript
index a1f0047..5a1b0df 100755
--- a/packages/vitec/Configuration/Sets/Vitecset/setup.typoscript
+++ b/packages/vitec/Configuration/Sets/Vitecset/setup.typoscript
@@ -17,6 +17,34 @@ config {
 
 @import 'EXT:headless/Configuration/TypoScript/ContentElement/*.typoscript'
 
+# =============================================================================
+# header_layout 100 = "Hidden" (decision 2026-09-04): such headers stay OUT of
+# the JSON - header, subheader and headerLink render empty. headerLayout (100)
+# stays in the payload so the front end could still tell why. Placed BEFORE
+# the `< lib.contentElementWithHeader` copies below, which snapshot this lib.
+# The content-blocks `data` path gets the same rule via HiddenHeaderProcessor.
+# =============================================================================
+
+lib.contentElementWithHeader.fields.content.fields {
+    header.stdWrap.if {
+        value = 100
+        equals.field = header_layout
+        negate = 1
+    }
+    subheader.stdWrap.if {
+        value = 100
+        equals.field = header_layout
+        negate = 1
+    }
+    headerLink.stdWrap.if {
+        value = 100
+        equals.field = header_layout
+        negate = 1
+    }
+}
+
+lib.contentBlock.fields.data.dataProcessing.20 = Evomedien\Vitec\DataProcessing\HiddenHeaderProcessor
+
 # =============================================================================
 # Headless list-plugin JSON renderers (TYPO3 v14: each plugin is its own CType)
 #
diff --git a/packages/vitec/Configuration/TypoScript/Headless/vitec_containers.typoscript b/packages/vitec/Configuration/TypoScript/Headless/vitec_containers.typoscript
index e70094a..fdf087b 100755
--- a/packages/vitec/Configuration/TypoScript/Headless/vitec_containers.typoscript
+++ b/packages/vitec/Configuration/TypoScript/Headless/vitec_containers.typoscript
@@ -72,10 +72,22 @@ tt_content.vitec_cols_50_50 {
             }
         }
 
+        # header_layout 100 = "Hidden": header, subheader and headerLink stay
+        # out of the JSON (same rule as lib.contentElementWithHeader).
         header = TEXT
         header.field = header
+        header.stdWrap.if {
+            value = 100
+            equals.field = header_layout
+            negate = 1
+        }
         subheader = TEXT
         subheader.field = subheader
+        subheader.stdWrap.if {
+            value = 100
+            equals.field = header_layout
+            negate = 1
+        }
         headerLayout = INT
         headerLayout.field = header_layout
         headerPosition = TEXT
@@ -87,6 +99,11 @@ tt_content.vitec_cols_50_50 {
                 parameter.field = header_link
                 returnLast = result
             }
+            stdWrap.if {
+                value = 100
+                equals.field = header_layout
+                negate = 1
+            }
         }
         tx_vitec_bg_variant = TEXT
         tx_vitec_bg_variant.field = tx_vitec_bg_variant