The application is purely based on a webbrowser allowing the users to access the website of the WhatsApp Webservice. The app itself does not store any customer details. All data is transmitted in the specified manner. However by using the WhatsApp webservice you are agreeing to the Terms of Service of WhatsApp. The terms of service of WhatsApp can be found here: http://www.whatsapp.com/legal/
If you face any problems please contact the developer at firstname.lastname@example.org .