How to create a private RSS feed?

If you want to create a private feed, make sure to use the iTunes Block tag in your feed. 
That will tell podcast apps NOT to index your content

ie: <itunes:block>yes</itunes:block>

Feeds using this Block tag won't be indexed in the app search engine and won't be displayed in popular podcasts lists
The share feature in the app will prevent sharing those podcasts/episodes

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