Dear lijinfu,
The DXF Import / Export interface is a commercial SDK available on a paid basis.
Learn more about the component on a dedicated page http://www.opencascade.org/support/products/dataex/dxf/.
If you wish to know about licensing and pricing of this component, please contact us (http://www.opencascade.org/about/contacts/).
Regards
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How can I get the DXF Import/Export module?
How can I get the DXF Import/Export module from opencascade?
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