Blog post that requires them to login

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Hi,

What plugin does it use to require them to sign up or log in to read all post content on my blog?

sample:

https://preview.redd.it/x25d6j5et5bd1.png?width=1275&format=png&auto=webp&s=04616c81982b976f5a225c68b7dd77e019cd4c51

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