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The architectural engineering was caught running unlicensed copies of Autodesk R14.
Autodesk offered them a chance to go legit with a steeply discounted upgrade to R15 - on the condition that all their copies of R14 would be destroyed.
The firm agreed -
but their copies of R14 are spotted on eBay, complete with hand written activation codes.
There was never a legal transfer of title or license to the vendor.
His recourse is against the architectural engineers responsible for this flim-flam -
assuming he wasn't part of it from the beginning.