The fare rules are also available via online ITA software (http://matrix.itasoftware.com).

After logging in, selecting your travel dates, and clicking on a particular itinerary, one can click on the "show booking details" link in the upper-left corner. In the booking details section that then appears underneath your itinerary, you will see which fare codes have been applied to generate the fare. Clicking on the "rules" link next to any of the fares will spit out the rules for the fare code of interest.