Which of the following is NOT a principle under the APP?

The principle that is not under the Australian Privacy Principles (APP) is the usability of digital content. The APP focuses on handling personal information and encompasses principles such as the quality of personal information, security of personal information, and access to personal information, which are integral to protecting individuals' privacy rights.

Quality of personal information ensures that the information collected is accurate, relevant, and not misleading, which is vital for organizations to maintain the integrity of the data they hold. Security of personal information mandates that organizations take appropriate measures to safeguard personal data against threats such as unauthorized access, loss, or misuse, thus protecting individuals' privacy.

Access to personal information allows individuals to request and obtain their personal data from organizations, reinforcing transparency and accountability in the way personal information is managed.

In contrast, usability of digital content pertains more to the user experience and accessibility of information rather than the protection or management of personal data under the APP, which is why it does not align with the core principles established by this legislation.