How does this secured notes work? Will it be able to use by person or it is for organizations? Can I share for another people?
There is a presentation for SecuredNotes:
http://secnote.org/wp-content/uploads/2018/10/Presentation_eng.mp4You can use it without any limitations.
To have access to SN you need access to wallet (MetaMask acc) and password you encrypted your note. In his case user get access to note. you can create password, can use one.