Steganography means the art and science of hiding information by embedding covert messages within other, ostensibly innocent messages. In most cases steganography works by replacing bits of useless or unused data in habitual computer files with bits of different, invisible secret information. The MLA steganography is quite different and consists in converting any number of arbitrary format files into a Maple .mla file. It is evident that an average Maple user cannot be able to recover the original files hidden in the Maple Library Archive file. Therefore, the presented method can be useful, inter alia, in protecting files against unauthorized copying.