Code to Add Signature in PowerPoint using Java. For further details: https://kb.aspose.com/slides/java/how-to-add-signature-in-powerpoint-using-java/

How to Add Signature in PowerPoint using Java.java

import com.aspose.slides.DigitalSignature;
import com.aspose.slides.Presentation;
import com.aspose.slides.SaveFormat;

public class AsposeTest {

	public static void main(String[] args) throws Exception {//Main function to add a signature to a presentation in Java
		
		
        // Set the license
        com.aspose.slides.License lic = new com.aspose.slides.License(); 
        lic.setLicense("Aspose.Total.lic");

        // Create a presentation
        Presentation presentation = new Presentation();

        // Load the PFX certificate by providing the password
        DigitalSignature digitalSignature = new DigitalSignature("certificate.pfx", "mypass");

        // Set the signature comments
        digitalSignature.setComments("Test comments for the digital signature");

        // Add the signature to the presentation
        presentation.getDigitalSignatures().add(digitalSignature);

        // Save the presentation
        presentation.save("SignedPresentation.pptx", SaveFormat.Pptx);

        System.out.println("Done");
	}
}