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@dangoodin As someone who works for a different inkjet print company - I'd say it's pretty terrible engine design if you could maliciously craft a cartridge to contain a virus.
The amount of information which needs to be stored on the cartridge is fairly small.
If the data is not in the format you expect - reject it as invalid. [HP is known to be quite good at this!]
I'm happy to be proven wrong with a POC, but this smells like FUD to me.