Ο ΓΚΠΔ Συναντά τον Διεθνή Διαστημικό Σταθμό: Πώς τα Δικαστήρια Ερμηνεύουν τους Ρόλους των Υπευθύνων Επεξεργασίας Δεδομένων

The intersection of the General Data Protection Regulation (GDPR) και Information Society Services (ISS) continues to present complex legal challenges, particularly around the concept of data ελεγκτήςship. The GDPR defines a ελεγκτής as the entity that determines the purposes και means of processing personal data. Yet when digital platforms—many of which qualify as ISS—interact with users και third-party content providers, the lines of responsibility blur.

Recent case law from the Court of Justice of the European Union (CJEU) has significantly expκαιed the interpretation of joint ελεγκτήςship, placing new obligations on platform operators, website owners, και service providers engaged in collaborative data processing. Below, we explore key judgments και their implications for platform accountability.

Facebook Fan Page Case (C-210/16): The Birth of Joint Controllership

In Wirtschaftsakademie Schleswig-Holstein v Facebook Irelκαι, the CJEU held that an administrator of a Facebook Fan Page was a joint ελεγκτής together with Facebook for the processing of visitor data. The administrator used Facebook Insights, a tool that provides anonymized statistics about user engagement.

Key Findings:

• Even though the page administrator could not access personal data directly, the CJEU found that it influenced the purposes και means of data processing by configuring the page και selecting target demographics.
• The decision introduced a broad και functional definition of joint ελεγκτήςship, emphasizing actual influence over data use, not just access.

Implications:

• Organizations embedding third-party services or analytics tools on their websites may be jointly liable for data processing.
• ISS providers offering configurable services (such as page customization, advertising preferences, or tracking settings) must assess joint responsibilities under Article 26 GDPR.

Fashion ID Case (C-40/17): Social Plugins και Shared Responsibility

In Fashion ID GmbH & Co. KG v Verbraucherzentrale NRW, the CJEU addressed whether a website that embeds a Facebook “Like” button is a joint ελεγκτής for the transmission of personal data to Facebook.

Key Findings:

• The operator of a website is a joint ελεγκτής for the collection και transmission of personal data (such as IP addresses και browser information) to Facebook.
• The operator is not a ελεγκτής for subsequent processing carried out solely by Facebook.

Implications:

• This ruling highlights the granular nature of joint ελεγκτήςship, limited to specific stages of data processing.
• Websites using embedded tools must disclose data transfers in their privacy notices και, where required, obtain valid consent for third-party data collection.

Jehovan Todistajat Case (C-25/17): Offline Application of Joint Controllership

Although not focused on an ISS, the Jehovan Todistajat case further solidified the broad scope of joint ελεγκτήςship. Members of the religious community collected personal data during door-to-door preaching without formal documentation or centralized storage.

Key Findings:

• The religious community και individual members were joint ελεγκτήςs under GDPR, even without formal coordination or access to the full dataset.
• The Court emphasized the importance of common purposes in establishing ελεγκτήςship, even where technical means are fragmented.

Implications for ISS:

• Platforms και affiliates working together—even informally—on user data collection can be jointly liable.
• Informal or decentralized processing structures do not shield entities from joint ελεγκτήςship obligations.

Bundeskartellamt v Meta (Case T-201/22): Competition Meets GDPR

Although still under judicial development, the German competition authority’s case against Facebook (now Meta) challenges the excessive data collection practices under both GDPR και competition law. The CJEU will need to clarify whether platform dominance και user consent interact under data protection principles.

Emerging Trend:

• Courts και regulators are increasingly treating platform-wide tracking και data consolidation across services as potentially abusive or unlawful when not accompanied by informed, freely given consent.

Key Takeaways for ISS Providers

1. Assess Joint Controllership Proactively
   Any collaboration involving shared tools, plugins, or analytics features can create joint responsibilities. Formalize arrangements και clarify roles through contracts και privacy policies.
2. Segment Processing Phases
   Liability may apply only to certain stages of processing. Clearly identify where your organization initiates or contributes to data collection και transfer.
3. Strengthen Transparency και Consent Mechanisms
   Embedding third-party tools? Disclose them prominently και obtain user consent where legally required—especially for marketing και profiling.
4. Implement Joint Controller Agreements (JCA)
   Under Article 26 GDPR, joint ελεγκτήςs must establish a Joint Controller Agreement, allocating responsibilities και providing a point of contact for data subjects.
5. Track Legal Developments Beyond Data Protection
   Issues of joint ελεγκτήςship now intersect with competition law, consumer protection, και platform regulation. Stay aware of broader legal trends affecting digital services.

Συμπέρασμα

The CJEU’s evolving case law has firmly established that Information Society Services can share ελεγκτήςship responsibilities with website operators, partners, και even users, depending on the nature of the data interaction. For legal advisors και compliance teams, it is no longer enough to classify a platform as a neutral host. The actual influence over how data is collected και used is now the decisive factor.

As the regulatory environment grows more complex under the Digital Services Act, ePrivacy Regulation, και ongoing GDPR enforcement, ISS providers must adopt a comprehensive και documented approach to data governance και ελεγκτής responsibilities.

Need help reviewing your data processing relationships or drafting GDPR-compliant joint ελεγκτής agreements? Our data protection team advises platforms και digital service providers across the EU on structuring lawful, transparent data practices. Reach out for a consultation.