Re Mark's question about the ethics of revealing that a proprietary system is crackable: I believe there is every right and duty to make the vulnerability publicly known. However, this can be done without disclosing enough of the content of the badly-protected information as to come in for heat. For example, one might post little snippets of a source code file which by themselves aren't usable but which the original owners will instangly recognise. This would be akin to the "fair use" of quotations from literature and poetry in critical reviews. And I also believe it would stand up in court, because the material which was revealed in the quotations could not be used in and of itself to devalue the content of the original complete work. -gg