<blockquote>
I found it mentionned with the mark *“\<L\>”* instead of *“(L)”* in the lyrics of a filk song 17 inspired
by the Dune science fiction saga by American author Frank Herbert. The
lyrics were signed *“\<L\> 1992 by Jeremy Buhler”* with a note at the end of
the file *“PS - \<L\> means copyleft”*.
</blockquote>

Aymeric Mansoux, Sandbox Culture (2017)