<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)