Allow robot access to protected content

Anyone know how to allow Google's robots to index protected content?

My company has a site that requires a subscription to access the info,
but we'd like to have google index those pages. I see there are many
sites who've managed this.


I can't allow by user-agent since my authentication software doesn't
allow that. Is there any way to give Google a username and password? Or

is there an IP, or range of IPs, that google uses?


Thanks.