Which of the following are considered sources of space laws?

Sources of space law include customs, treaties, and decisions made by international courts, making this option the most accurate. Customs refer to established practices that evolve over time and influence how states conduct themselves in space. Treaties, such as the Outer Space Treaty of 1967, provide formal agreements among nations regarding the use of outer space, establishing fundamental principles such as the peaceful use of space and the prevention of territorial claims. International courts, through their rulings, interpret and apply these treaties and customary laws, helping to resolve disputes and clarify legal frameworks governing space activities.

The other choices, while related to aspects of space activities, do not serve as primary sources of space law. National security regulations pertain more to individual countries' domestic laws and may not be universally applicable. Commercial space ventures represent the growing private sector's involvement in space but are primarily governed by the existing legal frameworks rather than being sources of law themselves. Government data restrictions focus on the limitation of access to specific data rather than establishing general principles of space law.