It takes a lot of hard work to design and finalise my patterns so please don't share them, even with your closest BFF who I'm sure would love to own it. Thing is your BFF may have other BFF's and so on and so on
If you want to make and sell the finished physical cross stitch then go for it, but not on an industrial scale (I'm looking at you China!). I just ask that you give me design credit. Online that would be via a link back to my shop here on Etsy or, if you're selling at craft fairs etc please give written credit either with each design or with the patterns on your booth.