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37-553: DWG (from drawing ) is a proprietary binary file format used for storing two- and three- dimensional design data and metadata . It is the native format for several CAD packages including DraftSight, AutoCAD , ZWCAD , IntelliCAD (and its variants), Caddie and Open 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. DWG (denoted by

74-510: A 30-person development team in Chernihiv , Ukraine (almost students of Chernihiv Polytechnic National University ). Ukrainian engineers play an important role in developing ODA technologies, including our interoperability toolkits for DWG and Autodesk® Revit® files, and many other areas. On 4 April, 2022 in a response to full-scale Russian invasion of Ukraine and continuous shelling of Chernihiv Neil Peterson , ODA President, announced

111-417: A company or organization for its own benefits, and the restriction of its use by others is ensured through patents or as trade secrets. It is thus intended to give the licence holder exclusive control of the technology to the (current or future) exclusion of others. Typically such restrictions attempt to prevent reverse engineering, though reverse engineering of file formats for the purposes of interoperability

148-820: A distinction between .dwg as a file format and the DWG technology environment . As neither RealDWG nor DWGdirect are licensed on terms that are compatible with free software licenses like the GNU GPL , in 2008 the Free Software Foundation asserted the need for an open replacement for the DWG format. Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries' in 10th place on their High Priority Free Software Projects list. Forked in late 2009 from libDWG, GNU LibreDWG can read all DWG files from version R13 on. But

185-505: A drawing triggers an essentially irrelevant warning message when the file is opened in AutoCAD. In 2006, Autodesk applied for registration of US trademarks on "DWG", "DWG EXTREME", "DWG TRUECONVERT", "REALDWG", "DWGX", "DWG TRUEVIEW". As early as 1996, Autodesk has disclaimed exclusive use of the DWG mark in US trademark filings. Out of these applications, only TRUSTEDDWG has been registered as

222-480: A final refusal to register DWG as a trademark owned by Autodesk. They were quoted as saying: 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

259-411: A petition for cancellation of SolidWorks' trademark registration for DWGEDITOR. 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's US District Court suit against SolidWorks. In early 2007, Autodesk petitioned

296-577: A trademark by the USPTO . 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

333-553: Is Open Design Alliance , a non-profit consortium created in 1998 by a number of software developers (including competitors to Autodesk), released a read/write/view library called the OpenDWG Toolkit, which was based on the MarComp AUTODIRECT libraries. (ODA has since rewritten and updated that code.) In 1998, Autodesk added file verification to AutoCAD R14.01, through a function called DWGCHECK. This function

370-535: Is a free and open-source application that can work with the DWG files by using the proprietary ODA File Converter for .dwg and .dxf files from the Open Design Alliance (ODA). 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 a free and open-source 2D CAD application that can open DWG and DXF files using its own library. Autodesk DWG TrueView

407-486: 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. Proprietary format Proprietary formats are typically controlled by

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444-428: Is generally believed to be legal by those who practice it. Legal positions differ according to each country's laws related to, among other things, software patents. As control over a format may be exerted in varying ways and in varying degrees, and documentation of a format may deviate in many different ways from the ideal, there is not necessarily a clear black/white distinction between open and proprietary formats. Nor

481-499: Is interested can register and attend the conference. The following is an incomplete list of members of the Open Design Alliance. The following is an incomplete list of founding member organizations of the Open Design Alliance. Asking those who benefit from ODA solutions to help support our Ukrainian developers: https://www.opendesign.com/blog/2022/april/oda-organizes-support-ukraine-developers Since 2016 ODA has

518-448: Is the control of the files. If the information is stored in a way which the user's software provider tries to keep secret, the user may store the information by virtue of having generated it, but they have no way to retrieve it except by using a version of the original software which produced the file. Without a standard file format or reverse engineered converters, users cannot share data with people using competing software. The fact that

555-428: Is there any universally recognized "bright line" separating the two. The lists of prominent formats below illustrate this point, distinguishing "open" (i.e. publicly documented) proprietary formats from "closed" (undocumented) proprietary formats and including a number of cases which are classed by some observers as open and by others as proprietary. One of the contentious issues surrounding the use of proprietary formats

592-533: The GNU GPL . Therefore, the FSF placed the goal 'Replacement for OpenDWG libraries' in 10th place on their High Priority Free Software Projects list. Created in late 2009, GNU LibreDWG is a free software library released under the terms of the GNU GPLv3 license. It can read DWG files from version R13 up to 2021, and write R2000 DWG files. Also in 2008 Autodesk and Bentley Systems agreed on exchange of software libraries, including Autodesk RealDWG, to improve

629-462: The .dwg filename extension ) was the native file format for the Interact CAD package, developed by Mike Riddle in the late 1970s, and subsequently licensed by Autodesk in 1982 as the basis for AutoCAD . From 1982 to 2009, Autodesk created versions of AutoCAD which wrote no fewer than 18 major variants of the DWG file format, none of which is publicly documented. The DWG format is probably

666-456: The LibreDWG library, offered under the GNU GPLv3 , could initially not be used by most targeted FOSS graphic software, such as FreeCAD , LibreCAD and Blender , because of a GPLv2/GPLv3 license incompatibility . A GPLv2 licensed alternative is the libdxfrw project, which can read simple DWGs. Some of these CAD licenses were only fixed recently to be able to use LibreDWG's GPLv3. FreeCAD

703-477: The Open Design Alliance and Dassault Systèmes SolidWorks 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 by SolidWorks . Autodesk subsequently filed

740-511: 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 Unsubstantiated claim. Others point out that the failure of "100% compatibility" means only that loading such

777-660: The USPTO to cancel the Open Design Alliance's "OpenDWG" trademarks, claiming that they had been abandoned. This cancellation action was suspended pending disposition of Autodesk's US District Court suit against SolidWorks. 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. In January 2010, on

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814-463: 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 available Application Programming Interfaces (APIs). On November 13, 2006, Autodesk sued the Open Design Alliance alleging that its DWGdirect libraries infringed Autodesk's trademark for

851-572: The decision. The USPTO affirmed in 2013 their refusal to recognise DWG as a trademark. Despite this, Autodesk websites still claimed DWG as a trademark after the decision. 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. In 2015 Autodesk's website has a section title About DWG in which they try to make

888-489: The files they were opening were created by an Autodesk, or RealDWG application, reducing risk of incompatibilities. 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 the Free Software Foundation asserted the need for an open replacement for the DWG format, as neither RealDWG nor DWGdirect are licensed on terms that are compatible with free software license like

925-571: The format in the past may lose all information in those files. This is particularly common with formats that were not widely adopted. Open Design Alliance Open Design Alliance is a nonprofit organization creating software development kits (SDKs) for engineering applications. ODA offers interoperability tools for CAD , BIM , and Mechanical industries including .dwg , .dxf , .dgn , Autodesk Revit , Autodesk Navisworks , and .ifc files and additional tools for visualization, web development, 3D PDF publishing and modeling. The Alliance

962-655: The free trial downloads of the ODAFileConverter. Drawings SDK also provides exchange of the following file formats to and from .dwg and .dgn: There are six types of ODA membership: There is also a free trial period. Open Design Alliance provides monthly production releases. Open Design Alliance holds an ODA conference every year in September. The two-day conference includes presentations from directors and developers and face-to-face meetings for non-members, members, ODA developers, and ODA executives. Anyone who

999-569: 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. 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. Because there

1036-656: The most widely used format for CAD drawings. Autodesk estimates that in 1998 there were in excess of two billion DWG files in existence. There are several claims to control of the DWG format. 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, under selective licensing terms for use in non-competitive applications. Several companies have attempted to reverse engineer Autodesk's DWG format, and offer software libraries to read and write Autodesk DWG files. The most successful

1073-451: 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. 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

1110-451: The user depends on a particular brand of software to retrieve the information stored in a proprietary format file increases barriers of entry for competing software and may contribute to vendor lock-in . The issue of risk comes about because proprietary formats are less likely to be publicly documented and therefore less future proof. If the software firm controlling that format stops making software which can read it, then those who had used

1147-420: The word "Autodesk", by writing the TrustedDWG code (including the word "AutoCAD") into DWG files it created. In April 2007, the suit was dropped, with Autodesk modifying the warning message in AutoCAD 2008 (to make it more benign), and the Open Design Alliance removing support for the TrustedDWG code from its DWGdirect libraries. In 2008, support was added for .dgn files with DGNdirect. In April 2010, DWGdirect

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1184-409: The word "Autodesk", by writing the TrustedDWG watermark (including the word "AutoCAD") into DWG files it created. Nine days later, Autodesk's attorneys won a broad and deep temporary restraining order against the Open Design Alliance. 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

1221-662: Was formed in February 1998 as the OpenDWG Alliance, with its initial release of code based on the AUTODIRECT libraries written by Matt Richards of MarComp. In 2002, the OpenDWG library was renamed to DWGdirect , and the same year, the alliance was renamed to Open Design Alliance. On November 22, 2006, Autodesk sued the Open Design Alliance alleging that its DWGdirect libraries infringed Autodesk's trademark for

1258-531: 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. In June 2011 the USPTO issued

1295-777: Was removed. In October 2018 ODA started work on IFC Solutio. In January 2019 Drawings 2019.2 introduced extrude and revolve 3d solid modeling operations as part of the standard SDK. Also that month, ODA announced the release of its new BimNv SDK. In May 2020 ODA switched to monthly releases. In June 2020 ODA released its free Open IFC Viewer, and in July 2021 ODA started development for STEP Support. In October 2021 ODA released its IFC validation engine. In January 2022 ODA started Scan-to-BIM development. In September 2022 ODA started MCAD SDK development, and in October 2022 ODA released STEP SDK for production use. In September 2024 ODA removed

1332-405: Was renamed to Teigha for .dwg files, OpenDWG was renamed to Teigha Classic and DGNdirect was renamed to Teigha for .dgn files. Since August 2017 (v. 4.3.1), Teigha contains production support for version 2018 .dwg files, including architectural, civil and mechanical custom objects. In February 2018 (v. 4.3.2), support for STL and OBJ files was announced. In September 2018 Teigha brand

1369-461: Was supported by an encrypted checksum and product code (called a "watermark" by Autodesk), written into DWG files created by the program. 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." This helped Autodesk software users ensure that

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