I haven't encrypted exclusive contents in my project so my reply might be inadequate. A few people with projects related to this don't encrypted their exclusive contents, as far as I know, rather they verify Web Monetization receipts in the backend and serve the appropriate contents if the receipt is valid, otherwise serve "unpaid" version of the content. I think this is already sufficient for hiding the contents from non-subscribers and from browsers' devtools.
I haven't encrypted exclusive contents in my project so my reply might be inadequate. A few people with projects related to this don't encrypted their exclusive contents, as far as I know, rather they verify Web Monetization receipts in the backend and serve the appropriate contents if the receipt is valid, otherwise serve "unpaid" version of the content. I think this is already sufficient for hiding the contents from non-subscribers and from browsers' devtools.
You can head to guide for receipt verifier yourself at Web Monetization's official documentation:
webmonetization.org/docs/receipt-v...
Alternatively, you might want to explore more options by yourself by exploring Interledger repos:
github.com/interledger
github.com/interledgerjs
github.com/coilhq