SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.
tr calls with more than one argument would have a 0x04 byte
in the returned string when no translation was found
(which always is the case when using Dolphin in English).