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On 12-Dec-16 16:52, Javier Guerra Giraldez wrote:
how is this different from the use of PostScript? it is a programming
language that interacts with the printer's firmware and modifies its

Many years ago a firm I knew got sued by a competitor for their use of RS-232 to connect a textile machine to a computer. The competitor had patented it (just the use of RS-232 for that type of machine, not the protocol) and won. They were not very happy about it.