The question of the status of pseudonymised data confounds many and is the subject of some controversy. OVIC published a report The Limitations of De-Identification – Protecting Unit-Record Level Personal Information. In its guidelines the Privacy Commissioner’s guidelines regarding Pseudonymity state that:
2.6Pseudonymity requires that an individual may deal with an APP entity by using a name, term or descriptor that is different to the person’s actual name. Examples include an email address that does not contain the person’s actual name, a user name that a person uses when participating in an online forum, or an artist who uses a ‘pen-name’ or ‘screen-name’.
2.7 The use of a pseudonym does not necessarily mean that an individual cannot be identified. The individual may choose to divulge their identity, or to volunteer personal information necessary to implement a particular transaction, such as credit information or an address at which goods can be delivered. Similarly, an APP entity may have in place a registration system that enables a person to participate by pseudonym in a moderated online discussion forum, on condition that the person is identifiable to the forum moderator or the entity.
2.8 An APP entity should bear in mind that the object of APP 2 is to provide individuals with the opportunity to deal with the entity without revealing their identity. Personal information should only be linked to a pseudonym if this is required or authorised by law, it is impracticable for the entity to act differently, or the individual has consented to providing or linking the additional personal information. An entity could also restrict access to personal information that is linked to a pseudonym to authorised personnel (for a discussion of the security requirements for personal information, see Chapter 11 (APP 11)).
In EDPS v SRB the Court of Justic of the European Union confirmed that pseudonymised data will not be personal data in all cases. Whether the data is actually personal depends on the context requiring an assessment of all the means reasonably likely to be used to identify the individual.
The Decision
The Court relevantly stated:
The requirement that Read the rest of this entry »