GDPR - EU Data Protection Rules Explained

About 2 min read

The GDPR (General Data Protection Regulation) is a comprehensive EU regulation on the protection of personal data that took effect in May 2018. It applies to every organization that handles the personal data of people within the EU (including companies based outside the EU), and violations can incur fines of up to 4% of global annual turnover or 20 million euros. As of 2025, more than 5 billion euros in fines have been imposed in total since the GDPR came into force, with major penalties against Meta and Amazon drawing particular attention.

Real-World Use Cases

"In a redesign of an e-commerce site for the EU, we implemented a cookie consent banner, brought the privacy policy into GDPR compliance, and developed features for handling data subjects' rights of access and erasure. We built a self-service portal where users can download and delete their own data, reducing the workload for handling DSARs (data subject access requests) by 90%."

Key Principles of the GDPR

The GDPR sets out seven principles: lawfulness, fairness and transparency (clarifying the legal basis and purpose of data processing); purpose limitation (no use beyond the collection purpose); data minimization (collecting only the minimum necessary data); accuracy (keeping data accurate); storage limitation (deleting data once it is no longer needed); integrity and confidentiality (appropriate protection through measures such as encryption); and accountability (the obligation to demonstrate compliance).introductory books on the GDPR (Amazon) offer a systematic way to learn about it.

Impact on Japanese Companies

Japanese companies that provide services to EU residents, companies with a presence in the EU, and companies entrusted with processing personal data by EU companies are all subject to the GDPR. When an e-commerce site accepts orders from the EU, it must implement a cookie consent banner, bring its privacy policy into GDPR compliance, and accommodate data subjects' rights (the rights of access, erasure, and data portability). Because Japan has received an "adequacy decision" from the EU, transfers of personal data to Japan are in principle possible without additional protective measures. Optimizing your privacy settings is the first step toward GDPR compliance.

Practical Compliance Points

The main action items are creating records of processing activities (ROPA), conducting data protection impact assessments (DPIA), and appointing a data protection officer (DPO). If a data breach occurs, there is an obligation to notify the supervisory authority within 72 hours, so you need to prepare your data breach response procedures in advance. Protecting systems that handle personal data with a strong, unique password for each service and applying encryption at rest and encryption in transit qualify as the GDPR's "appropriate technical measures."books on data protection law (Amazon) are also a useful reference.