DraftSight is a proprietary freemium 2D computer-aided design (CAD) software application developed by Dassault Systèmes. It lets users create, edit and view .dwg and AutoCAD DXF files. The user interface is quite similar to AutoCAD. The standalone, single-user version of DraftSight is free until a user saves or prints a document for the first time. They will then be asked to activate the product within 30 days using a valid email address and reactivate after six months and thereafter at 12-month intervals. Activation email and industry sectors must be the same as when initially activated, or the installation becomes unusable and must be installed again. Dassault is known for its 3D CAD software in the Aerospace industry and elsewhere.
DraftSight allows users to access DWG/DXF files, regardless of which CAD software was originally used to create them, including AutoCAD 2013 from V1R4. According to industry estimates, there are more than two billion DWG legacy files in existence. As stated on its home page, DraftSight uses Teigha Classic for .dwg files and Teigha for .dwg files specifications from the Open Design Alliance to interpret the dwg-file format.〔(DraftSight Features )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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