Enables high resolution Gravatar images on any browser that supports them.

Sales and rentals of (optionally DRM protected) digital content such as DVDs, video (HD+SD), audio books, ebooks (epub and PDF) and packaged content

Watermark EPUB, MOBI and PDF files in your WooCommerce store using the LemonInk service.

Sends a blog post or page to a user's kindle - widget and shortcode.

Tested up to 6.7.1