If you bought it it is yours to do with as you please. They can't really stop you from selling items made with the fabric. They can't even really stop you from selling the fabric you bought just as fabric w/o ever making anything with it. I imagine the printing on the fabric is more like the "Not for individual sale" printed on small packaged items that are sold in larger lots. Like the manufacturer doesn't want the business they're selling to to be making things with it after buying wholesale and then re-selling those items. They can't tell the individual consumer what can and can not be done with the item once purchased. I mean, imagine if you made something from fabric you bought, gave it to someone as a gift and that person decided to sell it later online or in a yard sale or even a craft show. They can't go after the person who recieved it as a gift. Likewise they can't go after you. They can not stop their product from being sold and re-sold indeffinatley. They sold it, it's not theirs anymore.
So, the bottom line is, it's yours, you bought it. Do what you want with it. Don't worry.
I hope that made sense.