The Foundation for Data Protection (Stiftung Datenschutz) has recently published a survey of existing privacy seals and certifications on its website. The goal of the survey is to make it easier for companies to choose an appropriate provider. Owing to its neutrality, the Foundation has not evaluated the quality of the providers. The survey is not considered exhaustive; instead it will be updated regularly.

Foundation for Data Protection (Stiftung Datenschutz) survey