On Observable Delegation of Personal Data by Watermarking

Privacy in business processes for personalized services is currently a matter of trust, since business processes require the delegation of personal data and users are not able to control their usage and so their delegation. Existing privacy-enhancing technologies like identity management systems consider access control but not the usage of personal data. Current work on usage control mainly considers classification and formalization of usage rules, so called obligations, and the delegation of personal data with a trusted third party (TTP). We investigate on digital watermarking in order to observe the enforcement of obligations for a delegation of personal data without a TTP.