Which of the following is NOT an exemption to the principles of the Data Protection Act?

The principles of the Data Protection Act establish certain key guidelines for the handling of personal data, but they also outline specific exemptions. Among these exemptions, national security, crime and taxation are recognized areas where the usual principles may not apply. Domestic purposes are also typically considered an exemption when personal data is processed for purely personal or household activities.

Contractual obligations, however, do not fall under these exemptions. The basis for this is that the principles of data protection are designed to safeguard individuals' personal information, even in scenarios involving contracts. While it’s necessary to process personal data to fulfill contractual obligations, this processing must still comply with data protection principles and regulations. Therefore, this choice is the correct answer, as it signifies an area that does not receive exemption under the Data Protection Act's framework. Understanding the scope and limitations of exemptions is crucial for ensuring adherence to data protection laws.