Open Cascade Technology
Starting with version 4.0 DG Kernel software includes components of Open Cascade 
    Technology  for geometric and rendering services. 
Programmatically services provided by OCCT can be accessed via
    OCCT group of interfaces The 
    interfaces have prefix IKO_.  
    
The source code for OCCT functionality is free and open. See more details in
    DG Kernel Developer. 
        
At the moment of release of this version only small portion of the OCCT 
    functionality has been exposed via DG Kernel interface. To explore full 
    avaliable functionality or full OCCT ducumenation we recommend installing the 
    current OCCT release from 
    https://www.opencascade.org/getocc/download/ 
Contact us  to request access to the features you are interested in. 
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