You are free to distribute these rules. You are free to modify these rules. And you are free to redistribute any modifications. If that's not clear enough, let me offer some examples. Go right ahead and run off as many copies as you need for your gaming group.
Pass copies out at conventions.
Post them on your own website. Create house rules and post them on your website. Change all the stuff you don't like, print up bound copies of the result and sell them for a profit. Second, Lore is still under my copyright. It is not public domain.