I have 10 cisco ex90 systems in my office, also vcs, tms, and mcu units. I want to upgrade them using Premium resolution key to 1080p. Do I need to buy unique key for every of ten systems i have? Or I just can buy one key and add it to all 10 systems? Will this work? And if not why? How it is controlled?
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Pretty sure it is done by serial number so you'll need a unique key. I've never seen a duplicate key, and they also differ for every new firmware version.
What Ken said is correct; each key is unique and is calculated using the serial number of each system.