Additional point...
All the above are excellent, valid, and important. You need to understand and follow the rules or you can find yourself in serious trouble.
You also asked about linking. You cannot link in such a way as to import the material or in any way represent that it is yours. However, you can link in the way of referral.
For example, Lisa would be happy I suspect (as would others) with a scenario like this. Say I have a financial site and am discussing the possibility of making money selling from a website. I could mention that an article explaining how to do it can be found at LINK. Even if, for some strange reason, she didn't really approve of my doing it, I do not think I would be in violation of any legalities.
Specifically, in regard to patterns, it is extremely likely that you would be able to get individual patterns (not in wholesale numbers from any one source) that the creator would welcome you to put on your site as long as you give full credit and a link to their site. This would help you and help them with traffic.
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