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Copyright permission for use of images in book

Hello there,

I am about to begin a book on unmanned vehicles and wanted to include a few types from ardupilot forum for reference and need some images. Reference to the link will of course be provided.
I saw that Ardupilot has mentioned the content as CC-by-SA. However, I would like to get clarification or permission to use images in my book. (country of origin of the book will be India).

Please help. Thank you so much.

@james_pattison @ppoirier

In case, any of you can help me with this query.

This is the license:

Servers by jDrones