A semiconductor package includes a chip mounting pad having a peripheral edge. A cryptographic unit 108 is used for cryptographic processing of respective blocks of the content data in dependence on respective keys. By employing the variable adjustment beams, the interaction between the generated beam and sound waves and an existing room geometry can be visually observed. Another method limits the number of automatic re-enablements that a market participant can request in response to prior breaches of risk thresholds that resulted in disabling any further trading by the market participant on the ETS.