![]() ![]() Service and all software available were usually supplied by manufacturers without separate charge until 1969. Until the late 1960s computers-large and expensive mainframe computers, machines in specially air-conditioned computer rooms-were usually leased to customers rather than sold. ![]() Traditional use of copyright no rights need be granted 5.4 Software limited to certain hardware configurationsįree and open (software must have source code provided).5.1 Proprietary file formats and protocols.5 Interoperability with software and hardware.4.2 Inspection and modification of source code.
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