Who Owns ? Who Sells? Who Develops ICAD?

I find it to very confusing as to who it is that I should be trying to deal with in regard to "Licencing" of any version of Intellicad. I do not know who it is that is the supposed "owner" of the product and/or the who it is that is actually developing the product with upgrades and/or newer versions. Who is CMS Intellicad, as opposed to Bricscad Intellicad ? Does "either" own the product? How can both be offering a different version of the same product and both be billed as the "current" version of the product. Is there a difference or are both sellers the same? What is the REAL deal here ? Totally Confused