I think, it's very clear, he wants to know what plugin responsible for calling concrete PrintToChat command.
Another question is: do dangerlord63 wants to intercerpt msg and hide it, or just obtain information about the source of msg.
I think it's impossible on user level to get info about plugin name.
However you can get player IDs, msg, and hide/modify it if you want.
See post. Wiki for
msg types.