Legal usage of Imagery?

Michael_GRMichael_GR Global Mapper UserPosts: 11
Hi all,
I need to use a large amount of imagery for an offline system. What are my legal options? which online sources allow me to download and then create derivative products based on that imagery?
If there are no free alternatives, which premium services would you recommend I use?

I also need the information to be available in varying resolutions if that makes any difference. Here's what I need: large sections of the US and UK (about 1000x1000km each) in very low resolution (16 meter) and then higher resolutions up to 1m in smaller areas of about 10x10 km, with intermediate resolutions in a a skirt around those areas.
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