rewrite rules

[Stefanita rares Dumitrescu]

hi guys,

can anyone please translate for me the below rewrite rules? regex and
rewrite is not my best quality unfortunately :( i know about rtfm ...
but it's just a thing that doesn't stick with me.

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?domain1.net [NC]
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?domain2.net [NC]
RewriteRule \.(zip|mp3)$ - [NC,F,L]
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