[scintill76]

It's your copy of the message. I'm not a lawyer, but I think if a copyright owner gives you a copy of their work, the law doesn't entitle them to take it back or rewrite it. A license agreement might, but nobody writes or signs those to cover text messages.

[speerer]

I think a more useful way to analyze this is that a message, when it is sent to you, is not serving the purpose of a copyright work. So copyright should not really be the lens through which we analyze this.

[almosthere]

Copyright isn't the entire point though. If someone says: I'm going to kill your husband in a text. Your husband is murdered, and you take your phone to the police, is that text still going to be there?