Hi,
WordPress Digital Store Solution – Premium Package add-on adds pricing and licensing option with WordPress Download Manager Plugin. WordPress Digital Store Solution – Premium Package add-on helps you to setup prices for your digital products and sell it easily from your WordPress site. So, if you want to build a library and sell single books you can do this with this plugin.
Elase if you want to have membership in the library you can use the membership plugin.
If you want to make a public library then you can also do that with WordPress download manager pro easily. You just need to create package for books which user can read and download from the website.
Thanks
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