How to remove the copyright box on a paper that uses the ACM sig-alternate.cls class file?

The accepted answer somehow doesn't work for me, but I found another solution here.

Simply add the following lines before \begin{document}:

\makeatletter
\def\@copyrightspace{\relax}
\makeatother

Use the etoolbox package and its \patchcmd macro to selectively change sig-alternate' s definition of \maketitle, i.e. remove the \@copyrightspace macro (which is responsible for the copyright space).

\documentclass{sig-alternate}

\usepackage[english]{babel}
\usepackage{blindtext}

\usepackage{etoolbox}
\makeatletter
\patchcmd{\maketitle}{\@copyrightspace}{}{}{}
\makeatother

\begin{document}

\author{lockstep}
\title{How to remove the copyright space}
\maketitle

\blinddocument

\end{document}

(The blindtext package is only used to add some dummy text to the example.)

I fixed the problem by writing \setcopyright{none} before \begin{document} at the top. FYI I was using overleaf.