It is clear that when developing CAD systems, we deal with the DWG format in one way or another. The last 5 years around this format there are active battles - Autodesk is trying to get exclusive rights, the CAD-community is actively resisting. At the same time, it is interesting that in the Russian market this struggle is practically not covered by anyone. For example, if you go to Russian Wikipedia, the following definition of the DWG format is published there:

There is much more information on the English Wiki, and the information itself is much less biased. For example, an English definition translation sounds like:

As a result, he took the liberty to correct the article in the
Russian Wiki , and for himself carried out some interesting facts.
First, I did not know that the file format was not originally owned by Autodesk - it was developed by Mike Riddle and used in the late 1970s in Interact CAD. And only in 1982, Autodesk bought this format for its decisions (that's all Autodesk is buying back).
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Secondly, I did not know that there is an open-source development of a library supporting the work with the DWG format. It turns out that the Free Software Foundation announced the need to replace the closed DWG format with an open one and at the end of 2009 the GNU LibreDWG libraries were created.
Thirdly, in more detail I figured out the “watermarks” and the TrustedDWG technology, which are built into the DWG format from Autodesk, and understood why no other format can wear the “100% compatible” logo. In my opinion pure water scam :-)
Fourth, it was very interesting to read about litigation Autodesk with competitors - the developers of SolidWorks and the consortium Open Design Alliance. At first glance, it seemed that Autodesk defended its rights to the DWG format. But then it became clear that we are talking only about the DWG trademark. At the same time, the DWG file format itself remains generally accessible, while competitors very cleverly abandoned the products with the letters DWG in the title and now remain with their own :-)
Well, and the most interesting, in my opinion, is this:
“In August 2010, the United States Patent and Trademark Office informed Autodesk's external law firm (Wilson Sonsini Goodrich & Rosati) that they have six months to appeal a decision on the DWG file format. Otherwise, it will be considered that Autodesk refused to attempt DWG registration. The six-month term expires
on March 3rd , according to updated data, on February 24, 2011. ”
Looking forward to Thursday ... :-) We are looking for information about the results ...
PS Direct link to the
article about the DWG format in Wikipedia .