If it requires a license ion the first instance even giving it away for promotional purposes will infringe. Before you commit to anything, I...

You will require a license to sell this content on things like clothing items. These licenses will usually require a certain number of years of...

I'm not sure what the problem is that you are identifying if you own the rights? You are free to sell a license to work that you own. If you...

I cannot conceive of a situation where this will be an issue for you. Copying someone's blueprints or designs may be an issue, but not the general...

I agree with my colleague. If you are just copying a very small segment to illustrate a point in your guide that is likely not an issue. But test...

Sure, you can demand you money back. If they refuse you can try initiating a charge back with the credit card company if you paid by credit card....

You are free to hire legal counsel here in the US and sue an infringer here.

As noted, it is not relevant that you are a non-profit regards to IP infringement. Whether you have a fair use argument here greatly depends on...

Whether your works will be considered a derivative work greatly depends. Some photos are taken with great care and attention given to creative...

You are free to negotiate and contract however you agree. Before you commit to anything, I suggest that you consult with a lawyer in private and...