The following final project thesis is the set of applications for an audio recognition and second screen system via digital audio fingerprinting and watermarking techniques.The work is based on the papers of  Avery Li-chun Wang; "An Industrial-Strength Audio Search Algorithm" ,2003 and Ingemar J. Cox, Senior Member, IEEE, Joe Kilian, F. Thomson Leighton, and Talal Shamoon, Member, IEEE ;Secure Spread Spectrum Watermarking for Multimedia,1997.