Majority of the existing software watermarking tools are suffering from the limitations of existing robustness notions and lack of resilience from a variety of attacks. In this paper we propose a novel software watermarking tool called Shellmark that is resilient to most of the well known watermarking attacks. We describe the basic building blocks of the Shellmark and a complete guideline how to run the tool using a motivating example. © 2019 Copyright held by the owner/author(s).