Comodo Free S/MIME Certificates: Too Restrictive for Prime Time?

I was considering a free S/MIME certificate from Comodo InstantSSL, but their Subscriber Agreement reads, in part:

3.4 The Subscriber shall not use the Email Certificate to transmit (either by sending by email or uploading using any format of communications protocol), receive (either by soliciting an e-mail or downloading using any format of communications protocol), view or in any other way use any information which may be illegal, offensive, abusive, contrary to public morality, indecent, defamatory, obscene or menacing…

Which means, we’ll give you this free certificate, but you may not use it to send or receive any encrypted or signed e-mail we don’t like.

How’s that for restrictive?

No thanks.