Adobe PDF Embed API

Hello! 

I'm using adobe embed API for my company. We're using embed API from Adobe that generate API Key on Adobe Website then we capture this API Key into APEX application using Java script. Afterwards we use call back method to save document as per adobe

Need your support to address the following clarifications please...

1- Is using the Adobe PDF Embed API free of charge, or does it require a subscription?

2- Using Adobe PDF Embed API, will the opened attachments in APEX applications be stored in the Adobe cloud server?

Thanks! Nader