<http://ns.inria.fr/covid19/PMC7198258#title>	<http://purl.org/dc/terms/subject>	"Open-source video games" .
<http://ns.inria.fr/covid19/PMC7198258#title>	<http://purl.org/dc/terms/subject>	"Open hardware organizations and companies" .
<http://ns.inria.fr/covid19/PMC7198258#title>	<http://purl.org/dc/terms/subject>	"Free culture movement" .