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I noticed that in the sample chapter you mention that subtlepatterns.com does not require a credit link (although appreciated)

This no longer seems to be the case, and the site now mentions only CC-BY-SA 3.0 (with no mention of not requiring attribution)

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You are right. The license is clear, but the FAQ page doesn't mention the credit link requirement. I'll email them and see what they prefer. Sometimes it is hard to give credit in iOS apps.

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