[cxr]

That's not what they're saying.

On the shelves are three insulin pumps: one with a 5-year warranty, one at a bargain barrel price that comes with no warranty, and one accompanied by a written offer allowing you to obtain the source code (and, subject to the terms of the GPL, prepare your own derivative works) at no additional charge any time within the next three years.

Weighing your options, you go with pump #3. You write to the company asking for the GPL source. They say "nix". They're in breach.

[schmuckonwheels]

The GPLv2 under which Linux is licensed does not prohibit that insulin pump from bricking itself if you tried to install "your own derivative work" that wasn't signed by the manufacturer.

This is not only possible but also prudent for a device which can also kill you.

[fn-mote]

Possibly true, but irrelevant to the post to which you are replying.

The argument is over providing you the source code.