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| DWG | |
|---|---|
 | |
| Filename extension | .dwg (plain).dws (standards).dwt (template) |
| Internet media type | image/vnd.dwg[1] |
| Developed by | Autodesk,Open Design Alliance and others |
| Initial release | 1982; 43 years ago (1982)[2] |
| Type of format | Computer-aided design |
| Open format? | Open but Proprietary[3] |
DWG (fromdrawing) is aproprietary[3] binaryfile format used for storing two- and three- dimensional design data andmetadata. It is the native format for severalCAD packages including DraftSight,AutoCAD,ZWCAD,IntelliCAD (and its variants),Caddie andOpen Design Alliance compliant applications. In addition, DWG is supported non-natively by many other CAD applications. The .bak (drawing backup), .dws (drawing standards), .dwt (drawing template) and .sv$ (temporary automatic save) files are also DWG files.
| Version | Internal version | AutoCAD versions |
|---|---|---|
| DWG R1.0 | MC0.0 | AutoCAD Release 1.0 |
| DWG R1.2 | AC1.2 | AutoCAD Release 1.2 |
| DWG R1.40 | AC1.40 | AutoCAD Release 1.40 |
| DWG R2.05 | AC1.50 | AutoCAD Release 2.05 |
| DWG R2.10 | AC2.10 | AutoCAD Release 2.10 |
| DWG R2.21 | AC2.21 | AutoCAD Release 2.21 |
| DWG R2.22 | AC1001, AC2.22 | AutoCAD Release 2.22 |
| DWG R2.50 | AC1002 | AutoCAD Release 2.50 |
| DWG R2.60 | AC1003 | AutoCAD Release 2.60 |
| DWG R9 | AC1004 | AutoCAD Release 9 |
| DWG R10 | AC1006 | AutoCAD Release 10 |
| DWG R11/12 | AC1009 | AutoCAD Release 11, AutoCAD Release 12 |
| DWG R13 | AC1012 | AutoCAD Release 13 |
| DWG R14 | AC1014 | AutoCAD Release 14 |
| DWG 2000 | AC1015 | AutoCAD 2000, AutoCAD 2000i, AutoCAD 2002 |
| DWG 2004 | AC1018 | AutoCAD 2004, AutoCAD 2005, AutoCAD 2006 |
| DWG 2007 | AC1021 | AutoCAD 2007, AutoCAD 2008, AutoCAD 2009 |
| DWG 2010 | AC1024 | AutoCAD 2010, AutoCAD 2011, AutoCAD 2012 |
| DWG 2013 | AC1027 | AutoCAD 2013, AutoCAD 2014, AutoCAD 2015, AutoCAD 2016, AutoCAD 2017 |
| DWG 2018 | AC1032 | AutoCAD 2018, AutoCAD 2019, AutoCAD 2020, AutoCAD 2021, AutoCAD 2022, AutoCAD 2023, AutoCAD 2024, AutoCAD 2025 |
DWG (denoted by the .dwgfilename extension) was the native file format for theInteract CAD package, developed by Mike Riddle in the late 1970s,[4] and subsequentlylicensed byAutodesk in 1982 as the basis forAutoCAD.[5][6][7] From 1982 to 2009, Autodesk created versions of AutoCAD which wrote no fewer than 18 major variants of the DWG file format,[8] none of which is publicly documented.
The DWG format is probably the most widely used format for CAD drawings. Autodesk estimates that in 1998 there were in excess of two billion DWG files in existence.[9]
There are several claims to control of the DWG format.[10] As the biggest and most influential creator of DWG files it is Autodesk who designs, defines, and iterates the DWG format as the native format for their CAD applications. Autodesk sells a read/write library, called RealDWG,[11] under selective licensing terms for use in non-competitive applications. Several companies have attempted toreverse engineer Autodesk's DWG format, and offer software libraries to read and write Autodesk DWG files. The most successful isOpen Design Alliance,[12] a non-profit consortium created in 1998 by a number of software developers (including competitors to Autodesk); it released a read/write/view library called theOpenDWG Toolkit, which was based on the MarComp AUTODIRECT libraries.[13] (ODA has since rewritten and updated that code.)
In 1998, Autodesk addedfile verification to AutoCAD R14.01, through a function called DWGCHECK. This function was supported by an encrypted checksum and product code (called a "watermark" by Autodesk), written into DWG files created by the program.[14][15] In 2006 Autodesk modified AutoCAD 2007, to include "TrustedDWG technology", a function which would embed a text string within DWG files written by the program: "Autodesk DWG. This file is a Trusted DWG last saved by an Autodesk application or Autodesk licensed application."[16] This helped Autodesk software users ensure that the files they were opening were created by an Autodesk, or RealDWG application, reducing risk of incompatibilities.[17] AutoCAD would pop up a message, warning of potential stability problems, if a user opened a 2007 version DWG file which did not include this text string.
In 2008 theFree Software Foundation asserted the need for an open replacement for the DWG format, as neither RealDWG[11] norDWGdirect arelicensed on terms that arecompatible withfree software license like theGNU GPL. Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries' in 10th place on their High Priority Free Software Projects list.[18] Created in late 2009,GNULibreDWG[19] is afree software library released under the terms of theGNU GPLv3 license. It can read DWG files from version R13 up to 2021, and write R2000 DWG files.
Also in 2008 Autodesk andBentley Systems agreed on exchange of software libraries, including Autodesk RealDWG, to improve the ability to read and write the companies' respective DWG and DGN formats in mixed environments with greater fidelity. In addition, the two companies will facilitate work process interoperability between their AEC applications through supporting the reciprocal use of availableApplication Programming Interfaces (APIs).[20]
On November 13, 2006, Autodesk sued theOpen Design Alliance alleging that its DWGdirect libraries infringed Autodesk's trademark for the word "Autodesk", by writing the TrustedDWG watermark (including the word "AutoCAD") into DWG files it created.[21] Nine days later, Autodesk's attorneys won a broad and deeptemporary restraining order against the Open Design Alliance.[22] In April 2007, the suit was settled, essentially on Autodesk's terms, with Autodesk modifying the warning message in AutoCAD 2008 (to make it somewhat less alarming), and the Open Design Alliance removing support for writing the TrustedDWG watermark from its DWGdirect libraries. The effect of the temporary restraining order and subsequent consent decree was to render the Open Design Alliance's DWGdirect libraries, from one point of view, incapable of creating DWG files that are 100% compatible with AutoCAD.[citation needed] Others point out that the failure of "100% compatibility" means only that loading such a drawing triggers an essentially irrelevant warning message when the file is opened in AutoCAD.[23]
In 2006, Autodesk applied for registration of UStrademarks on "DWG",[24][25] "DWG EXTREME",[26] "DWG TRUECONVERT",[27] "REALDWG",[28] "DWGX",[29] "DWG TRUEVIEW".[30][31]As early as 1996, Autodesk has disclaimed exclusive use of the DWG mark in US trademark filings.[32] Out of these applications, only TRUSTEDDWG has been registered as a trademark by theUSPTO. The REALDWG and DWGX registrations were opposed by SolidWorks. The DWG EXTREME, DWG TRUECONVERT, and DWG TRUEVIEW trademark registration applications all received substantial resistance, with the USPTO examining attorney requiring Autodesk to disclaim exclusive use of DWG as a condition for their registration.
In a non-final action in May 2007, the USPTO examining attorney refused to register the two DWG marks, as they are "merely descriptive" of the use of DWG as a file format name. In September 2007, Autodesk responded, claiming that DWG has gained a "secondary meaning," separate from its use as a generic file format name.[33]
As of June 22, 2008, all of Autodesk's DWG-related trademark registration proceedings were suspended by the USPTO, pending disposition of trademark opposition and cancellation petitions Autodesk had filed against the Open Design Alliance and Dassault SystèmesSolidWorks Corporation. The USPTO office actions notifying Autodesk of this noted that Autodesk was not the exclusive source of files with the format name DWG, and Autodesk does not control the use of DWG by others, either as a trademark or as a file format name, among other points.
In 2006, Autodesk filed an opposition with the USPTO to the trademark registration of DWGGATEWAY bySolidWorks.[34] Autodesk subsequently filed a petition for cancellation of SolidWorks' trademark registration for DWGEDITOR.[35] In both cases, Autodesk's basis was that they had "been using the DWG name with its CAD software products since at least as early as 1983." The opposition and cancellation actions were consolidated, and suspended pending disposition of Autodesk'sUS District Court suit against SolidWorks.[36]
In early 2007, Autodesk petitioned the USPTO to cancel the Open Design Alliance's "OpenDWG" trademarks, claiming that they had been abandoned.[37] This cancellation action was suspended pending disposition of Autodesk's US District Court suit against SolidWorks.[38]
In 2008, Autodesk sued SolidWorks in US District Court, arguing that through its marketing efforts, the term "DWG" has lost its original generic meaning and taken on a secondary meaning referring specifically to Autodesk's proprietary drawing file format, and therefore any use of "DWG" in competitive products amounted to trademark infringement.[39] In January 2010, on the morning that trial was scheduled to begin, Autodesk and SolidWorks settled the suit, with SolidWorks acknowledging Autodesk's trademark rights for DWG, surrendering its trademark registrations for its DWG related projects, and withdrawing its opposition to Autodesk's DWG-related trademark registrations.[40]
In April 2010, Autodesk and the Open Design Alliance settled their suit, with the Open Design Alliance agreeing to cancel its DWG-based trademark registrations and cease use of DWG and DWG-based trademarks in its product marketing and branding.[41] Because there was no adjudication in either case, the agreements between the parties are not binding upon the USPTO. In March 2010, the Office of the Deputy Commissioner for Trademark Examination Policy at the USPTO determined that evidence submitted by the Open Design Alliance two years earlier was relevant and supported a reasonable ground for refusal to register DWG as a trademark.[42]
In June 2011 theUSPTO issued a final refusal[43] to register DWG as a trademark owned by Autodesk. They were quoted as saying:[44]
DWG is merely descriptive of applicant's goods under Section 2(e)(1) of the Trademark Act for two reasons: (1) DWG is a recognized abbreviation for "drawing," and (2) .dwg is a file format used for computer-aided design (CAD) drawings made both with applicant's CAD software and others' CAD software.
Autodesk appealed the decision. TheUSPTO affirmed in 2013 their refusal to recognise DWG as a trademark.[45] Despite this, Autodesk websites still claimed DWG as a trademark after the decision.[46]
In late 2014 Autodesk again lost, this time at the United States District Court for the Eastern District of Virginia. The judge dismissed all their arguments.[47]
In 2015 Autodesk's website has a section titleAbout DWG[48] in which they try to make a distinction between .dwg as a file format and theDWG technology environment.
As neither RealDWG[11] nor DWGdirect are licensed on terms that are compatible withfree software licenses like theGNU GPL, in 2008 theFree Software Foundation asserted the need for an open replacement for the DWG format. Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries'[18] in 10th place on their High Priority Free Software Projects list.[49] Forked in late 2009 from libDWG,GNULibreDWG[19] can read all DWG files from version R13 on. But the LibreDWG library, offered under theGNU GPLv3, could initially not be used by most targetedFOSS graphic software, such asFreeCAD,LibreCAD andBlender, because of a GPLv2/GPLv3license incompatibility.[50][51][52] A GPLv2 licensed alternative is the libdxfrw project, which can read simple DWGs.[53] Some of these CAD licenses were only fixed recently to be able to use LibreDWG's GPLv3.
FreeCAD is afree and open-source application that can work with the DWG files by using the proprietary ODA File Converter for .dwg and .dxf files from theOpen Design Alliance (ODA).[54] The ODA also provides a freeware stand-alone viewer for .dwg and.dgn files, ODA Drawings Explorer, which runs on Windows,Linux, and Mac OS X.
LibreCAD is afree and open-source 2D CAD application that can open DWG and DXF files using its own library.
The quality of DWG format compatibility in these non-Autodesk CAD applications can be assessed using theBudweiser.dwg benchmark drawing.[55]
Autodesk DWG TrueView is a freeware,closed source, stand-alone DWG viewer with DWG TrueConvert software included, built on the same viewing engine as AutoCAD software. The freeware Autodesk Design Review software adds a possibility to open DWG files in Design Review to take advantage of measure and markup capabilities, sheet set organization, and status tracking.
With over two billion AutoCAD DWG files worldwide...
