Block external access from Nginx

I use the codes below to block access from improper links to image and mp4 files: [CODE=nginx]location ~* .*\.mp4 { valid_referers none blocked dominio1.com www.dominio1.com dominio2.com www.dominio2.com; if ($invalid_referer) { return 403; } expires 365d; mp4; }
Block access to a particular folder: [CODE=nginx]location ~* \.(mp4)$ { root /home/admin/web/dominio.com/public_html; valid_referers none blocked dominio.com www.dominio1.com; if ($invalid_referer) { return 403; } }
I hope the information is useful.