There is no reason a private delivery system is incompatible with a government interest in fostering education.

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Still, the federal government has experienced similar struggles in seeking to align incompatible computer system across multiple intelligence agencies.

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In 1993, NTT DoCoMo, Japan's principal mobile-phone carrier, opted for a technical standard called Personal Digital Cellular (PDC), which was incompatible with the Global System for Mobile Communications (GSM), the standard adopted by most of the rest of the world.

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Then there have been subtle but important barriers: For instance, Macintosh computers have long been incompatible with a security keycard-reading system known as Common Access Cards system, or CAC, which is heavily used by the military.

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It's incompatible with the more common methane in the interstate pipeline system.

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That happened on a smaller scale in the 1990s, when manufacturers introduced three incompatible digital sound systems (in addition to the existing analog system).

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After the UK Supreme Court ruled that denying offenders the right of appeal was incompatible with their human rights, the government has proposed a system under which they could be removed if they proved they no longer posed a risk to the public.

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They need to prevent any actions that would undermine the security of their system and also they need to protect themselves from the user demands that can arise when someone has an incompatible hardware setup.

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