Subscribing to a SugarCRM calendar in Outlook is relatively easy, but getting Google calendars to subscribe to my SugarCRM calendar is throwing up an extra challenge. Can anyone offer help or advice please?

When I enter the calendar URL into Google calendars it returns the error message "Could not fetch the URL because robots.txt prevents us from crawling the URL."

Our SugarCRM is hosted on a web server which is out on the net, so I think the robots.txt is probably quite important. But what I don't know is:
1. Can the robots.txt be made specific to let certain crawlers through - ie. the Google calendar crawler ?
2. If not, would there be security/privacy implications of changing or even removing our robots.txt file?

Thanks,

Philip