A copyright protection method for digital media is disclosed. For other locations, the shear modulus information is calculated as a function of the sparsely measured values and strain information. Additionally, receipt of a plurality of portions of the potentially unwanted data is requested, where each of the plurality of portions is requested from a different device. A blade can be fitted into a given slot corresponding to the particular curvature on the peripheral blade surface and the squareness of the inner and outer edges of the blade is determined. Subsequently, an anomaly detector can detect anomalous correlations between individual ones of the clusters in the self-organized map based upon at least one configurable correlation metric. Another cross-section includes transverse bores originating in the lower edge of the probe.