What is a Data Controller?
A Data Controller is the natural or legal person, public authority, agency, or other body which, alone or jointly with others, determines the purposes and means of the processing of personal data. Under the Data Protection Act (2018), the Data Controller holds the primary legal responsibility for ensuring that all personal data is processed fairly, lawfully, and transparently. In simple terms, the controller is responsible for ensuring the control of the personal data.
What are the Primary Legal Responsibilities of a Data Controller?
The primary legal responsibilities of a Data Controller include implementing appropriate technical and organisational measures to ensure and demonstrate that data processing is performed in accordance with the GDPR. Controllers are strictly accountable for maintaining a Record of Processing Activities (RoPA), conducting Data Protection Impact Assessments (DPIAs) for high-risk projects, and responding to Data Subject Access Requests (DSARs) within the mandatory 30-day calendar limit.
What are the Responsibilities of a Data Controller
A data controller has significant responsibilities under data protection regulation, these include:
- Comply with the data protection principles
- Honour the rights of the data subject
- Deliver data protection by design and by default
- Implement data protection policy and ensure colleagues understand responsibilities
- Keep records of processing activities
- Manage the transfer of data to third parties
- Ensure safeguards are in place for data transfers to third countries.
- Appoint a data protection officer (if required)
- Ensure appropriate technical and organisational measures are in place
- Manage and mitigate any risks arising from personal data processing
- Cooperate with the supervisory authority
How do Data Controllers Manage Data Processors?
When a controller passes on responsibility for processing to a data processor it will retain control through the contract that it puts in place to manage this relationship.
What is the Difference Between a Data Controller and a Joint Controller?
A Joint Controller relationship exists when two or more organisations together determine the purposes and means of processing the same personal data. If the controller shares this responsibility jointly with another controller then it is advisable that a contract is in place (but not mandatory), but there should be a data sharing agreement in place to ensure that the data subject’s have complete transparency surrounding the relationship and the processing of their data.
An example of a Joint Controller might include the relationship between a franchisor and its franchisee, where processing of data is shared across platforms and responsibilities – a key point to recognise is that the data is being processed by both parties for the same or similar purpose.
What are Controllers in Common?
Controllers in common is a description for a relationship where multiple controllers process data, yet the purpose of processing is different (and often a contractual agreement does not exist), for example an employer sharing personal tax details with a tax authority. In these cases the statutory obligation overrides and it is unlikely that any further due diligence would be undertaken.
How Can ProvePrivacy Help Automate Data Controller Accountability?
ProvePrivacy simplifies the complex duties of a Data Controller by providing a centralised platform for Data Protection Compliance. The system enables the maintenance of the Record of Processing Activities (RoPA), manages data sharing agreements, and tracks technical and organisational measures. This ensures that the Data Controller has a real-time, audit-ready log of all compliance efforts, significantly reducing the risk of regulatory penalties.
Comparison: Manual Spreadsheets vs. ProvePrivacy Automation
| Feature | Manual Management | ProvePrivacy Platform |
|---|---|---|
| Accountability Evidence | Fragmented and static | Centralised logs |
| RoPA Maintenance | Difficult to update and verify | Dynamic data mapping |
| DSAR Management | High risk of missing 30-day limit | Automated tracking and alerts |
| Joint Controller Logs | Manual contract tracking | Integrated vendor assessments |
| Audit Readiness | Weeks of manual preparation | Easy regulatory report exports |
Sources
- Data Protection Act (2018): https://www.legislation.gov.uk/ukpga/2018/12/contents
- ICO Guide to Data Controllers and Processors: https://ico.org.uk/for-organisations/guide-to-data-protection/guide-to-the-general-data-protection-regulation-gdpr/controllers-and-processors/
