mIRC is compatible with SSL, see http://www.mirc.co.uk/ssl.html - You do have to install DLLs, but this can be done with a simple OpenSSL setup program.
Some countries have various restrictions on the use, importation, and exportation of 'strong' encryption, of which SSL is typically classified. Basically, some governments don't like the idea that they can't snoop on everyone in their country.
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