Notes blocked by a password

[TaniaDe]

I want to know if i can post a note on a PDF document and block it with a password to other users can post another note, but can't change mine.

Also i need to now if the user's name can be blocked too with a password or something like that.

[Lzcat - Tracker Supp]

Sorry, this is not allowed by PDF specification.
Using password protection you can block document reading (until password supplied) and/or restrict some modifications (but for all same objects in document, so you cannot protect one annotation and not protect other).