A Right Of The People
While I can't recall the particulars I'm certain there was a legal precedent set in Canada that governments have a duty to use a format accessible by all or as many citizens as possible. Free software should take precedence over proprietary software as people are more enabled by free software when petitioning a level of government. And open source software should take precedence over closed source software in dealings with the government for the same reasons and for the TAO of good democratic government. ( Transparency, Accountability, Openness ) Proprietary software is an impediment much as it would be an impediment for a level of government to demand a petition from it's citizens be in a format inaccessible to some by dint of cost.