Securing an online magazine

Good day dears,

Not sure where I can find what I am searching for; pls advise if you can;
I am trying to find a way where only subscribers can read an online magazine and denying them to share its content 'free' with others.

Is there a type of file I can secure or an online security way for that purpose?

Thank you

The protection of online content has always been very problematic. Various methods have been tried but with only limited success. The question isn't really a good fit for this forum.