This book constitutes the refereed conference proceedings of the 9th Annual Privacy Forum, APF 2021. Due to COVID-19 pandemic the conference was held virtually. The 9 revised full papers were carefully reviewed and selected from 43 submissions. The papers are organized in topical sections on Implementing Personal Data Processing Principles;

Implementing Personal Data Processing Principles.- The Right to Customization: Conceptualizing the Right to Repair for Informational Privacy.- A case study on the implementation of the right of access in privacy dashboards.- Consent Management Platforms under the GDPR: processors and/or controllers? .- Improving the Transparency of Privacy Terms Updates.- Privacy Enhancing Technologies.- User-generated pseudonyms through Merkle trees.- Towards Improving Privacy of Synthetic DataSets.- Promoting Compliance with the GDPR.- Protection of Personal Data in High Performance Computing Platform for Scientific Research Purposes.- Representing Data Protection Aspects in Process Models by Coloring.- Trackers in Your Inbox: Criticizing Current Email Tracking Practices.

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