I'm not sure how you would translate sistemas operacionais de terminais which is covered by the law, but to me it reads "terminal operating systems". If a terminal has its own OS, it is probably not "dumb" in any meaningful sense, and no one really uses terminals anyway except for retro enthusiasts. Even people still using, like, VM/MVS on a mainframe are connecting via a PC running a 3270 emulator.

Lei № 12.965 (2014) defines a terminal (which applies in Lei 15.211) as any internet-connected computer or device.

I read it as end user OS.