A user through a mobile or fixed terminal informs an agent hosted by an operator server of subjects in respect of which content is requested. The apparatus may include a padding module to add a pad byte to uneven packet fragments of a packet, a partial checksum generator module to generate a partial error control value for each packet fragment, a pseudo-header generator module to generate a pseudo header for the packet, and a partial checksum combiner module to combine the partial error control values into an error control value. The deformable beam may include a first end, a second end, and an elongated body extending therebetween.