The business /license model you've gone for being what it is, does it entitle people who's update period has expired to still get bug fixes?
Or is your version essentially frozen as is.
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Your version is essentially frozen, in the same way once a major update is released, only that receives bug fixes and the old major version is no longer maintained.
If there's a really embarrasingly serious problem we would probably backport a fix out of good faith, but it will be taken on a case by case basis, and it's much more likely you'd encounter the bug, report it and then we distribute a fix well within your updgrade period.