Which app is best for adding DRM to my eBooks?

[idadecesaris]

 Can anyone offer any suggestions as to an app that would put the drm on my ebooks?  i only see the one app in the shop and it only has 5 reviews...

[SocialAutoPost]

I did some research and here are some apps I found, please check if any of these fulfill your requirements :

Digital Content Sales with DRM -- Paid app (I think this is the one you talking about)

https://apps.shopify.com/digital-content-sales-with-drm-flickrocket

Courses & Memberships -- Free to install and Pay as you go

https://apps.shopify.com/inflowkit-2

Conjured Memberships -- Paid app

https://apps.shopify.com/membership-program