The Regulation distinguishes subscriber data, data requested solely to identify a user, traffic data and content data. Subscriber data include a name, address, email address, telephone number and information about a service subscription. An IP address, source port and timestamp may be requested for the sole purpose of identifying a user.
Traffic data provide additional context about the use of a service. They can include the source and destination of a message, the location of a device, time, duration, size or other communications metadata. Content data include digital text, voice, video, images and sound.
The classification has direct consequences. Under Article 5(3), a production order for subscriber data or data requested solely for user identification may be issued for all criminal offences. Under Article 5(4), traffic and content data generally require an offence punishable in the issuing State by a maximum custodial sentence of at least three years, or one of the special offence groups listed there. Article 5(2) also requires necessity and proportionality.