I think that's an interesting magical theory question.
I think it's fair to say that if the secret-keeper wrote "The safehouse is at the Burrow, located at..." on a piece of paper, that's a security risk, and anyone who read it could get in, even if the paper were only intended for a specific party.
The aspect of intentionality in the journals interacts interestingly with that, though. Is someone reading a private message meant for someone else more like "I read that piece of paper" (and thus granting access) or more like "a person not the secret-keeper is trying to give me the secret" (and thus not granting access)?
I would venture that while the journal monitoring was working people reading the monitoring would gain access; even if the SK's intentionality was not to share that with them, the facts of the setup were such that all such messages were automatically shared with them, and thus included.
The fact that someone has to intervene to allow someone to read their private messages, though, leaves it ambiguous to me - does that intervention mean that the magic is effectively passed on by that person, who is not the SK, or is it more like "Hey, I found this note, why don't you read it?"
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I think it's fair to say that if the secret-keeper wrote "The safehouse is at the Burrow, located at..." on a piece of paper, that's a security risk, and anyone who read it could get in, even if the paper were only intended for a specific party.
The aspect of intentionality in the journals interacts interestingly with that, though. Is someone reading a private message meant for someone else more like "I read that piece of paper" (and thus granting access) or more like "a person not the secret-keeper is trying to give me the secret" (and thus not granting access)?
I would venture that while the journal monitoring was working people reading the monitoring would gain access; even if the SK's intentionality was not to share that with them, the facts of the setup were such that all such messages were automatically shared with them, and thus included.
The fact that someone has to intervene to allow someone to read their private messages, though, leaves it ambiguous to me - does that intervention mean that the magic is effectively passed on by that person, who is not the SK, or is it more like "Hey, I found this note, why don't you read it?"