I recommend using WMI to obtain the BIOS serial number because all the
values recommended by you and Isabelle (thus far) can be
edited/changed. The only way to change the BSN is to replace the
motherboard. In the case of a clone machine returning an empty BSN, I
substitute with a hash value of that empty string via SHA256. When this
is combined with make & model it serves well enough for my purposes.<g

--
Garry

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