This paper presents architectures for the secure delivery of images over open networks, such as the Internet or broadcast networks. Those systems integrate access control mechanisms and tracking procedures, once the pictorial material has been accessed. We will show how these architectures have been tested in the context of the connection of cultural databases to the Internet (AQUARELLE system) and in the context of broadcasting of high- value TV programs (OCTALIS system [1], used during the football World Cup). This work shows the interest for a global integrated design of delivery systems in which watermarking, monitoring, and public key infrastructures based on trusted third parties are designed according to coherent functional models.