a method of masking data on a storage medium for selective playback upon demand or for transcription to another medium is provided . the method comprising the steps of determining the position of the start location on the storage medium , determining the position of the stop location on the storage medium , positioning at least one data track on the storage medium between the start location and the stop location such that the data track has , adjacent thereto , enough space or time for accepting a concealed data track , and impressing data on the storage medium for generating the concealed track having a hidden recording area such that the hidden recording area contains concealed data which can be accessed upon demand for transcription to another medium or for playback . the present invention can be adapted for use with different storage media such as , for example , a compact disk , a read - only memory compact disk , a mini - disk , a photo compact disk or the like . more particularly , the step of impressing data on the storage medium for generating the concealed track further comprises the step of generating the concealed track by identifying a position within the gap relative to either location or time for working with a player or transcriber and impressing the concealed track on the storage medium at the identified position .