Not All Freedoms Are Created Equal
Most every level in the computing stack can be modified by the user. Except for the commercially purchased application and data.
Vendors specifically restrict unauthorized modification, re-use, and redistribution of application and data. Not only the above is usually very prohibitive financially, it is prohibited, period.
This creates an onerous [Licensing Regime].
Update: Not anymore… seems like the [Hardware Layer] in the [Computing Stack] is under attack. Lexmark is putting small type on its ink cartridge boxes that prevent the buyer from exercising her free will.