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c++ - License of the C++ compiler source code

As far as I understand the source code of the Digital Mars C++ 
compiler is available for 59 USD here: 
https://www.digitalmars.com/shop.html

What is the license under which this source code is made 
available?

Could I e.g. use it to develop a new C++ dialect and make it 
available as open source?

Thanks.
Apr 16