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Not by Opera, it seems, but it still means very reasonable coverage.
I had a feeling the SP2 disabled this feature, but I can't test that.
Been there done that ..stopped doing it ( most browsers thought my site was installing malware ;) ..locked up visitors machines and required reboot of their system so they could get back their clipboard facility ..;)
very very bad for PR ..( public relations ..not page rank )
Use watermarks ..life is complicated enough as it is ..