EU Court of Justice · 19 October 2016
Breyer
In plain English
A dynamic IP address kept by a website operator is personal data for that operator if it has legal means to identify the person using information held by the internet access provider. National law also cannot rule out weighing the operator's legitimate interests.
What the court ruled
a dynamic IP address registered by an online media services provider when a person accesses a website that the provider makes accessible to the public constitutes personal data … in relation to that provider, where the latter has the legal means which enable it to identify the data subject with additional data which the internet service provider has about that person.
Related
The official text is quoted word for word from the English version of the source named under it; only the version published in the court’s own records is authoritative. The plain-English line is Fino’s own summary, not legal advice.