A method includes receiving a first linearity ciphertext that represents a first biometric template encrypted using a relational linearity encryption scheme. The inventive device is characterized in that it comprises a detector for recording detected information on the marking elements, and a control and evaluation unit that is adapted to determine whether the marking elements carry out marking operations based on the detected information. The prefetch controller may further include a tuple history queue configured to receive an instructionstride tuple, the instructionstride tuple generated by subtracting a last data access address from the first missed data address. The partitioning of educational topics allows advertisers to deliver episodic advertising over an extended time period.