http://www.comcast.net/terms/subscriber.jsp

Material Downloaded through the Service: In addition to any content that may be provided by us, you may access material through the Service that is not owned by Comcast. Any such material may be downloaded from the Service only for your personal, non-commercial use, and you are not allowed to redistribute that material over any network (other than a residential home network located in the Premises) or sell or offer for sale that material. Unless other terms and conditions expressly apply to specific content, you may make: (a) one machine readable copy, (b) one backup copy, and (c) one print copy of any material downloaded from the Service; any other copying, or any redistribution or publication of any downloaded material, including, without limitation, posting to any other online service, must be with the express permission of the relevant copyright holder. In any permitted copying, redistribution or publication of copyrighted material, any changes to or deletion of any copyright notice are prohibited. Other terms and conditions may apply to your use of any content or material made available through the Service that is not owned by Comcast. You should read those terms and conditions to learn how they apply to you and your use of any non-Comcast content.

IP Addresses: Comcast will provide you with dynamic Internet protocol ("IP") address(es) as a component of the Service and these IP address(es) can and do change over time. You will not alter, modify, or tamper with these dynamic IP address(es) or those of any other customer. You agree not to use a dynamic domain name server or DNS to associate a host name with the dynamic IP address(es) for any commercial purpose. You also agree not to use any software on or in conjunction with any computer(s) or network device connected to the Service that provides for static IP address(es). If applicable, Comcast will release and/or recover the dynamic IP address(es) upon disconnection, discontinuance, or termination of the Service or this Agreement.


It appears as though you can d/l but not u/l