"The need to securely access or move information between networks with different security classifications is an ongoing operational necessity within the Government of Canada (GC). Accessing or moving data from one network to another enables business operations, information sharing and decision making.
Any movement of information across networks has the potential of introducing new threats to the networks and jeopardizing the security of the information holdings. While several methods can be considered for moving information across networks (a.k.a. security domains), only Communications Security Establishment (CSE)-approved Cross Domain Solutions (CDS) should be used for information at security levels above Protected B."