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The DWG format is the most widespread in the world of CAD and CAD is a proprietary format from Autodesk.There are several requests for the DWG is contrôlé8. Autodesk is who decides and validates the DWG as its native format for CAD applications. Autodesk sells libraries for reading and writing, called RealDWG9, under conditions of licensing for the selective use for applications not only competitive.Many companies have attempted to perform a Reverse engineering of Autodesk's DWG format, and provide libraries for reading and writing DWG format.It's Open Design Alliance (ODA) (Formerly OpenDWG Alliance), a non-profit consortium created in 1998, with the most success.The ODA was able to consolidate 1,000 software developers in 40 countries, not least because its ranks are in Nemetschek, AVEVA, Bentley Systems, SolidWorks, Oracle. They produced a library to read / write, known at first OpenDWG based on libraries MarComp AutoDirectAutoCAD has filed several lawsuits in the Open Design Alliance (but also Dassault Systemes SolidWorks) for the use of the acronym for the DWG and the use of watermarks OAO TrustedDWG. The operation ended in 2010, an amicable resolution: ODA, must give up its product names including the letters DWG, but can continue to develop interoperable with AutoCAD software and use the ". DWG "for its filename. And libraries (DWGdirect, DWGdirectX, DWGdirect.Net) are combined in a new development platform: TEIGHAThe Open Design Alliance is responsible therefore to promote industrial open standards formats for exchange between CAD systems. The development platform Teigha, provides the tools for creating a wide range of graphics techniques. Teigha supports the format. But also the dwg format. MicroStation DGN and provides the ability to import and export to other file formats.The Open Design Alliance maintains and publishes the Open Design Specification for. Dwg


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