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Based on one specially created corpus of U.S. cybersecurity-related laws, this study employs the corpus approach to examine the referent objects and securitizing actors in U.S. cybersecurity legislative discourse, which are two critical issues in constructing security, including cybersecurity. Through corpus data analysis, it is found that unlike traditional security, cybersecurity has become more people-oriented in terms of referent objects with critical infrastructure as a key referent object. Additionally, the role of private sectors and cooperative security are highlighted in U.S. cybersecurity legislative discourse. From a sociosemiotic perspective, it is noted that the meaning-making process of U.S. cybersecurity not only is conveyed by the texts but also interacts with other sign systems, such as historical background, cyberspace as a virtual realm and social contexts, which suggests that the specific meanings of signs constructing cybersecurity and cybersecurity itself should be interpreted in specific temporal or spatial contexts. Furthermore, a sociosemiotic approach to U.S. cybersecurity legislative discourse also offers valuable insights to how signs and concepts in cybersecurity contribute to sketching a holistic landscape of cybersecurity and further security on a large scale. [ABSTRACT FROM AUTHOR]