@conference {spie07:auth, title = {A Novel Interpretation of Content Authentication}, booktitle = {Security, Steganography, and Watermarking of Multimedia Contents}, series = {Proc. of SPIE}, year = {2007}, month = {January}, publisher = {SPIE}, organization = {SPIE}, address = {San Jose, California, USA}, keywords = {authentication, data-hiding, watermarking}, author = {Pedro Comesa{\~n}a and F{\'e}lix Balado and Fernando P{\'e}rez-Gonz{\'a}lez}, editor = {Edward J. Delp and Ping W. Wong} }