In creating their iPhone, apparently Cisco modified software owned by the public, but didn't publish their modifications as required by GPL licensing standards. This from the GPL Violations Project:

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"...the timing is just perfect...For someone talking about Apple using Cisco's property, actually they're infringing on copyright themselves. So it's just a double standard."

Sure, Cisco owns "iPhone" fair and square, but this move was just tacky...and a little stupid.

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Cisco's iPhone Violates GPL [via digg]