Marketing & advertising · GDPR

Marketing & advertising — GDPR: files, audiences and influence

Advertising relies on prospect databases, audience data and influencer-related data. The GDPR requires lawful bases, transparency, governance of data partnerships and verification of data origin. This guide details these obligations and a tailored roadmap.

DPO / CISO team — Data Comply One Updated on 15 June 2026

In brief

  • Regulation: GDPR.
  • Agencies, media networks, advertisers and influencer marketing players are concerned, often as joint controllers.
  • Establish and inform.
  • Framing data partnerships.
  • Verifying the origin of files.
  • Fines of up to €20M or 4% of global turnover.

Regulatory deadlines

The key dates of this regulation.

May 2018

Entry into application

In force

What does GDPR cover?

GDPR governs prospect databases, audience data and partnerships between advertisers, ad networks and platforms. Roles must be clearly defined (joint controllership is common) and the origin of data files must be verified.

Influence involves audience and creator data that must be governed.

Is the 'Marketing & advertising' sector concerned?

Agencies, ad networks, advertisers, and influencer marketing players are all affected, often as joint controllers. Platforms and data providers act as controllers or processors depending on the context.

Creators and their audiences are data subjects.

Detailed obligations

Establish grounds and inform

Define legal bases and information requirements for prospects and audiences.

Framing data partnerships

Clarify roles and sign agreements (DPA, joint controllership).

Verify the origin of files

Controlling the origin and legal basis of the files being processed.

Govern influencer activity

Protecting the data of audiences and creators.

Secure and limit

Security and appropriate retention periods.

Sanctions & risks

Fines of up to €20M or 4% of global turnover. Exploiting files of dubious origin and unregulated data partnerships are major risks.

Common mistakes in the sector

  • 1Suspicious files. Using data of unverified origin.
  • 2Unclear roles. Fail to clarify data partnerships.
  • 3Unregulated influence. Neglect audience data.
  • 4Excessive retention. Retaining files for too long.

Practical case

An advertiser was using files from partnerships without clarifying roles or verifying their origin. The remediation process formalises roles and DPAs, verifies data provenance, and governs influence data.

Compliance roadmap

  1. 1

    Map. Mapping files, audiences, and partnerships.

  2. 2

    Clarify roles. Define responsibilities and DPA.

  3. 3

    Verify the origin. Control the origin of files.

  4. 4

    Govern influencer activity. Protect the data.

  5. 5

    Document. Maintain the register.

Frequently asked questions

Yes, by clarifying roles (sometimes joint controllership) and governing data flows.

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