As IRC data is transmitted in plain text, what is send from your PC to the IRC server can be captured or recorded by your ISP. For example,
[!})B
EHo@#Q).Th=PWPRIVMSG hocchan :xdcc send #101
can be captured by the ISP. What the above says is that the user is sending an IRC message to hocchan to request for xdcc pack #101. If SSL is used to connect to the IRC server, then any information that is exchanged between your PC and the IRC server will be encrypted.
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