The use of space technologies has become a sine qua non condition for the well-being of people around the globe, resulting in a strong imperative to defend the space assets in orbit, and related infrastructure on Earth. Thus, the concept of space security is implying per se a military security dimension, however limited by the principle of peaceful purposes stipulated by the 1967 Outer Space Treaty. Nevertheless, the concept of space security is evolving, including aspects related to space economy, space debris mitigation and space sustainability. Overall, the terms “space for security” and “security in space” are different but complementary. The use of space technologies to ensure security on Earth and the operation of space assets without incoming threats implies space security policies.