Since late 2007 Digic-based cameras are shipped using Canon's own Operating System named DryOS. It replaces VxWorks from Wind River which has been used before on Digic II and some Digic III cameras. DryOS had existed before and was in use in other Canon hardware, such as digital video cameras and high-end webcams. The reason for the switch were most probably royalties Canon had to pay for VxWorks.