© 2019 Association for Computing Machinery. In a smart city environment, a huge amount of data is monitored in real time every day by the interconnection between Information and Communication Technologies (ICT's) and Internet of the Things (IoT). However, this increases the vulnerabilities and risks of the acquired data. Most of these data is private information and in order to preserve its ownership protection, authentication, and secret communication we propose our Color Watermarking based on DCT and YCbCr Color Space for Privacy Preservation. The results of experiments show that our method is robust against JPEG and JPEG2000 compression, as well as it has high imperceptibility. Due to its characteristics is ideal to be used in smart cities environments.