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HP raising Instant Ink subscription pricing significantly
(www.ghacks.net)
This is a most excellent place for technology news and articles.
the article sorta implies that only 'hp+' denies use of third-party cartridges for life of the printer.. but just plain 'instant ink' subs do, too, through mandatory automatic firmware updates to the printer that will immediately install a firmware update with 'dynamic security' that blocks all but 'genuine' oem cartridges.