Why Mentor Spend 4 Millions to Buy CADRA ?

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    I just saw  a news saying Mentor spend 4 millions buy CADRA product . CADRA is  only an Autocad-lite like 2D MCAD draft tool and there are many  2D Autocad-like tools avaible, free or very cheap.  I don't think any Mentor user be willing to buy an Autocad-lite tool from Mentor Graphics and there is no new-technologis in CADRA.  So I am puzzled by this strage buy. Anyone knows what be behind it?