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I would like to put my corporate legal infrastructe on an internal secure conferencing system. News (with crypto-signed articles) is ideal. Without a "destroy all copies" concept I cannot do this.

Um.. You can't give people copies of something and then destroy all copies of that thing unless you can trust those people to destroy *their* copies of it on your request. If you *can* trust them to do this, then the ratings-system solution I mentioned a minute ago will work. Just ask everyone to set their useragents to "delete" when they encounter a "deleted, signed The Boss" mark on an article. Regards, Bryce signatures follow  "To strive, to seek, to find and not to yield." <a href="http://ugrad-www.cs.colorado.edu/~wilcoxb/Niche.html"> bryce@colorado.edu </a> -----BEGIN PGP SIGNATURE----- Version: 2.6.2 Comment: Automatic PGP clearsigning under Unix with Bryce's Auto-PGP v1.0 iQCVAwUBMHQ2BfWZSllhfG25AQGD7QP9HtmYVNL0OHvlaPEXzRdFI/XXwzNVjjhK QnDsK1Gxr9JXnTOORHjOuLNCp4L039UD3S43YU8Jhoo+/Gs1OHhUEK4fOlB9uV6G QS4kvBSb00ygFSZSuEgyeGVEdlDhHBw9hA06lcc2UC11yU6TM7yZFn6ko3XRrIOR 0I3nIWalaWQ= =FLQ9 -----END PGP SIGNATURE-----