H. Kelkoul and  Y. Zaz,  Digital Cinema Watermarking State of Art and Comparison.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2017, vol. 122(2). 287 - 292
    [viewed 17 April 2021]. Available from: https://publications.waset.org/pdf/10006722.