alpha numeric code is unique per box / account
it is used as finger printing by Cignal TV as provider.
once in a while, enterprising cable tv operators use Cignal TV feed as part of their channel line up.
when security fingerprinting happens, it will display that alpha numeric codes on your screen.
If a cable tv operator uses a cignal feed, it will appear on all cable tv subscriber on that particular channel.
when this happen, that particular code is associated to a particular account of which they can de-activate.
in effect, that account is blacklisted and cannot be used anymore.
hth
smart card # is found on your inserted card on the STB.
power off unit, unplug power supply
if Humax; open right side panel of your stb and unplug the smart card, there you will see your SC number
if Pace; it is visible outside and can be easily removed
return card properly and plug in power supply.