Show and hide blog posts based on permissions

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Hi everyone,

I'm trying to create a blog that shows premium posts only to premium content subscribers. I am using the ProBlog addon. Does anyone know how I can set permissions at the blog-post level? Perhaps a custom attribute? That seems like the best approach, if it's possible, because I could assign that attribute to show by default on the Create Blog Post window, so the client can easily select this setting for blog posts that are reserved for premium users.

In addition, I would like to be able to set certain styles on these posts while in the blog_list view, so that premium users can see which blog posts they're actually paying to get access to. It seems to me that it would also be easiest to be able to set this using a custom attribute, if that is possible.

Are there any ideas about how to achieve this goal? Many thanks for any help!!