Sell digital content with expiration dates

Hi there,  I'm looking into how to offer a library of digital content for purchase—each piece of content is a standalone purchase, access is granted post-purchase.  Ideally I'd be able to set an expiration date for each piece of content (e.g. a year) where it would have be purchased again to view.   It's not ideal to offer as a digital download, we want users coming back to the site to view their purchased content.  Thank you much!