Rights Protection for Trajectory Streams

More and more trajectory data are available as streams due to the unprecedented prevalence of mobile positioning devices. Meanwhile, an increasing number of applications are designed to be dependent on real-time trajectory streams. Therefore, the protection of ownership rights over such data becomes a necessity. In this paper, we propose an online watermarking scheme that can be used for the rights protection of trajectory streams. The scheme works in a finite window, single-pass streaming model. It embeds watermark by modifying feature distances extracted from the streams. The fact that these feature distances can be recovered ensures a consistent overlap between the recovered watermark and the embedded one. Experimental results verify the robustness of the scheme against domain-specific attacks, including geometric transformations, noise addition, trajectory segmentation and compression.