an audio processing method for an electronic device includes a first audio file , a second audio file , and a first digital watermark to perform an audio processing method . the first digital watermark has ownership information regarding the first audio file . a first discrete audio array of the first audio file and a second discrete audio array of the second audio file are generated . a cipher code is generated using the first discrete audio array and the first digital watermark , and a second digital watermark is generated using the cipher code and the second discrete audio array . the first and second digital watermarks are compared , to confirm common ownership or otherwise of the second and first audio files .