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Late in 3.4 we have added the concept of lock to prevent an IU to be updated or uninstalled (see bug 227678). Currently the UI is taking into account these markers, but it should really be done by the planner. There is also an interesting intersection here with what we use to call Governor (bug 205068).
The planner is about providing mechanisms to do dependency resolution. Locks and such are more policies layered on top. As such I'm closing this as invalid.