diff --git a/lectures3/Pythonlearn-02-Expressions.pdf b/lectures3/Pythonlearn-02-Expressions.pdf
index 1c168e2a..ccd988f6 100644
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diff --git a/lectures3/Pythonlearn-02-Expressions.pptx b/lectures3/Pythonlearn-02-Expressions.pptx
index ef844615..81bc6534 100644
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diff --git a/lectures3/README.md b/lectures3/README.md
index e7ba3003..4f472ac1 100644
--- a/lectures3/README.md
+++ b/lectures3/README.md
@@ -4,8 +4,10 @@
 
 The `convert2pdf.sh` script converts all `.pptx` files in the current directory and its subdirectories into PDF format using LibreOffice’s command-line interface.
 
-Each converted PDF is saved in a `pdf` subdirectory located in the same directory as its source `.pptx` file. If the `pdf` directory does not exist, it is created automatically.
+Each PDF is saved in the same directory as its source `.pptx` file. 
 
+Each PDF is exported with PDF/UA (ISO 14289) specification and special accessibility tags enabled.
+See https://help.libreoffice.org/latest/en-US/text/shared/guide/pdf_params.html
 ---
 
 ## Requirements
@@ -70,7 +72,7 @@ Ensure this path is included in your system `PATH` environment variable, or upda
 
 * Recursively searches for `.pptx` files starting from the current directory
 * Converts each file to PDF using LibreOffice in headless mode
-* Outputs each PDF into a `pdf/` subdirectory alongside the original file
+* Outputs each PDF in the same directory as the PPTX file
 
 ---
 
@@ -107,12 +109,16 @@ Run the script from the directory containing your PowerPoint files:
 
 The script will process all `.pptx` files found in the current directory and its subdirectories.
 
+It will only generate a PDF when the PPTX is newer or the PDF does not exist.
+
 ---
 
 ## Notes
-* There's no official doc for the CLI convert to filter option names that correspond to the Impress UI options
-, but the option names can be found in the [source code](https://opengrok.libreoffice.org/xref/core/filter/source/pdf/). Look in files
+* PDF export command line options are documented [here](https://help.libreoffice.org/latest/en-US/text/shared/guide/pdf_params.html)
+
+* Related source code be found [here](https://opengrok.libreoffice.org/xref/core/filter/source/pdf/). Look in files
 `pdfexport.cxx` and `impdialog.cxx`.
+
 * The script assumes `.pptx` files are valid and readable by LibreOffice
 * Output PDFs will overwrite existing files with the same name in the `pdf` directory
 * Font availability on the system may affect final rendering in the PDF
diff --git a/lectures3/convert2pdf.sh b/lectures3/convert2pdf.sh
index 71fe59b3..df0ca523 100755
--- a/lectures3/convert2pdf.sh
+++ b/lectures3/convert2pdf.sh
@@ -45,6 +45,8 @@ if [ -z "$JAVA_HOME" ]; then
         echo "Please set JAVA_HOME manually if you encounter issues with LibreOffice."
     else
         echo "Detected JAVA_HOME: $DEFAULT_JAVA_HOME"
+        export JAVA_HOME="$DEFAULT_JAVA_HOME"
+        echo "Set JAVA_HOME to: $JAVA_HOME"
     fi
 else
     echo "Using existing JAVA_HOME: $JAVA_HOME"
@@ -58,14 +60,19 @@ if [ -z "$SOFFICE_PATH" ]; then
     exit 1
 fi
 
+# Define the PDF filter with options for PDF/A compliance and accessibility tags PDF
+# Reference: https://help.libreoffice.org/latest/en-US/text/shared/guide/pdf_params.html
+PDF_FILTER='pdf:impress_pdf_Export:{"PDFUACompliance":{"type":"boolean","value":"true"},"UseTaggedPDF":{"type":"boolean","value":"true"}}'
+
 # Find all .pptx files recursively starting from the current directory
 pptx_files=$(find . -type f -name "*.pptx")
 
 count=0
 error_count=0
+skip_count=0
 
-# Convert each pptx file to pdf
-for pptx_file in $pptx_files; do
+convert_pptx_to_pdf() {
+    local pptx_file="$1"
     # Get the directory containing the pptx file
     dir=$(dirname "$pptx_file")
     echo "Processing directory: $dir"
@@ -73,29 +80,30 @@ for pptx_file in $pptx_files; do
     # Get the filename without extension
     filename=$(basename "$pptx_file" .pptx)
     
-    # Create pdf subdirectory if it doesn't exist
-    pdf_dir="$dir/pdf"
-    mkdir -p "$pdf_dir"
-    if [ $? -ne 0 ]; then
-        echo "Error creating directory: $pdf_dir"
-        error_count=$((error_count + 1))
-        continue
-    fi
-
-    # Define output PDF path
+    # Define pdf paths
+    pdf_dir="$dir" # keep pdfs in same directory as pptx
     pdf_file="$pdf_dir/$filename.pdf"
     
-    # Convert pptx to PDF
-    echo "Converting: $pptx_file to $pdf_file"
-    "$SOFFICE_PATH" --headless --convert-to pdf:impress_pdf_Export:{"PDFUACompliance":true,"UseTaggedPDF":true,"ReduceImageResolution":true,"MaxImageResolution":300,"UseLosslessCompression":false,"Quality":90} --outdir "$pdf_dir" "$pptx_file"
-
-    if [ $? -eq 0 ]; then
-        echo "Successfully converted: $pptx_file"
-        count=$((count + 1))
+    if [[ ! -f "$pdf_file" || "$pptx_file" -nt "$pdf_file" ]]; then
+        # Convert because PDF does not exist or PPTX is newer
+        echo "Converting: $pptx_file to $pdf_file"
+        "$SOFFICE_PATH" --headless --convert-to "$PDF_FILTER" --outdir "$pdf_dir" "$pptx_file"
+        if [ $? -eq 0 ]; then
+            echo "Successfully converted: $pptx_file"
+            count=$((count + 1))
+        else
+            echo "Error converting: $pptx_file"
+            error_count=$((error_count + 1))
+        fi
     else
-        echo "Error converting: $pptx_file"
-        error_count=$((error_count + 1))
+        echo "Skipping: $pptx_file (PDF is up to date)"
+        skip_count=$((skip_count + 1))
     fi
+}
+
+# Convert each pptx file to pdf
+for pptx_file in $pptx_files; do
+    convert_pptx_to_pdf "$pptx_file"
 done
 
-echo "Conversion complete! $count files converted, $error_count files failed."
\ No newline at end of file
+echo "Conversion complete! $count files converted, $error_count files failed, $skip_count files skipped."
\ No newline at end of file
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