A UK Trading Standards officer contacted the Mozilla Foundation to report catching a business selling copies of Firefox. The organization confiscated the CDs with the intent to prosecute said business. When informed that such distribution was authorized, the officer first expressed disbelief that Free Software could be sold then said 'If Mozilla permit the sale of copied versions of its software, it makes it virtually impossible for us to enforce UK anti-piracy legislation'.
It demonstrates how the free software model disrupts the old proprietary way of doing things, where copying was theft and you were guilty until proven innocent.
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