diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 00000000..38dd608d
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,29 @@
+# Security Policy
+
+## Supported Versions
+
+The following versions are currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x.x   | :white_check_mark: |
+| < 2.0   | :x:                |
+
+## Reporting a Vulnerability
+
+Feel free to submit issues to info at mustangproject.org with [security] indicated in the subject. 
+We may ask back questions but we usually open (or communicate about) an issue (potentially in a private location you would be provided with access to) and decide on the severity within two working days. 
+
+Please indicate 
+* a proof of concept, if possible
+* If any of the information you submit, e.g. an invoice which can not be [anonymized](https://github.com/ZUGFeRD/einvoice-anonymizer), is confidential
+* A quick justification why you require a fix in a older version than he most up to date one, if you can not update to the most recent version
+* If you require encrypted communication (our GPG fingerprint will likely be 68F4 2269 8165 F0F5 63CA  A13B 7CB7 1548 B596 66A3)
+
+
+## After your Report
+
+We try to fix critical issues in less than a week, and release a fixed version in less than two weeks.
+
+Thank you for keeping our software safe!
+
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ValidationLogVisualizer.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ValidationLogVisualizer.java
index db68ccb2..7e7d8a17 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ValidationLogVisualizer.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ValidationLogVisualizer.java
@@ -1,5 +1,13 @@
 package org.mustangproject.ZUGFeRD;
 
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.StringReader;
 import org.apache.fop.apps.*;
 import org.apache.fop.apps.io.ResourceResolverFactory;
 import org.apache.fop.configuration.Configuration;
@@ -15,7 +23,7 @@ import javax.xml.transform.*;
 import javax.xml.transform.sax.SAXResult;
 import javax.xml.transform.stream.StreamResult;
 import javax.xml.transform.stream.StreamSource;
-import java.io.*;
+
 import java.nio.charset.StandardCharsets;
 
 public class ValidationLogVisualizer {
@@ -71,7 +79,7 @@ public class ValidationLogVisualizer {
 		return baos.toString(StandardCharsets.UTF_8);
 	}
 
-	public void toPDF(String xmlLogfileContent, String pdfFilename) {
+	public byte[] createPDFBytes(String xmlLogfileContent) {
 
 		// the writing part
 
@@ -112,7 +120,8 @@ public class ValidationLogVisualizer {
 // Step 2: Set up output stream.
 // Note: Using BufferedOutputStream for performance reasons (helpful with FileOutputStreams).
 
-		try (OutputStream out = new BufferedOutputStream(new FileOutputStream(pdfFilename))) {
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		try (OutputStream out = new BufferedOutputStream(baos)) {
 
 			// Step 3: Construct fop with desired output format
 			Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, userAgent, out);
@@ -139,6 +148,20 @@ public class ValidationLogVisualizer {
 		} catch (FOPException | IOException | TransformerException e) {
 			LOGGER.error("Failed to create PDF", e);
 		}
+		return baos.toByteArray();
+	}
+
+	public byte[] toPDF(String xmlLogfileContent) {
+		return createPDFBytes(xmlLogfileContent);
+	}
+
+	public void toPDF(String xmlLogfileContent, String pdfFilename) {
+		byte[] pdfData = createPDFBytes(xmlLogfileContent);
+		try (FileOutputStream fos = new FileOutputStream(pdfFilename)) {
+			fos.write(pdfData);
+		} catch (IOException e) {
+			LOGGER.error("Failed to write PDF to file", e);
+		}
 	}
 
 	private static class ClasspathResourceURIResolver implements URIResolver {