Regarding digital copyright law, as per my previous job as an online shop products administrator, if the image doesn't have a watermark on it, there are no legal repercussions on using it.There are tons of useful graphics and info out there which would be useful to new vapers. Our aim should be to present it in such a way that it is accessible to new vapers. I don't know what the ethics are of displaying other peoples (websites) information but there is plenty of "stolen" information which we have already shared on the forum. Diagrams like the ones below are very useful.
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However those with a watermark, you need to ask for permission and give credit where it's due. That's includes written articles, blogs, videos and other media. You also need to add the links where it directs to the original article written by that author.