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No. Unless it is being used for a purpose that affects the neighbor.
Without permission it is illegal but if they ask you to then it's legal because you have their consent.
It depends on where they are and what you do with the photos. If they are in public and you don't use the photos for commercial purpose, it is legal. However, there are issues if the person is in their home and you are "peeping" or if you intend to use the photos commercially.
Probably not unless they have a copyright on the photos.
Absolutely not! Taking anything from anywhere without permission is theft. DeviantART doesn't make anything different.
Some websites offer stock photos that are free to use. You can legally copy these pictures and use them. If you copy a picture and use it for monetary gain without permission, it is illegal.
If the photo is taken from a public space - yes
Laws can vary by location, but overall, it wouldn't be illegal to take a picture simply without permission. However, if he expressed that he did not want the picture taken, it can be more of a problem. There is more of a chance that you are violating a law. There is also the side issue of why would you do that to your friend if they didn't want you to?
yes since there is a reasonable expectation of privacy
Techincally, he looked at some other scientist's photos (without permission), and he interpreted them.
You cannot view another person's photos that are located on their phone without their permission.
I think that if you think about it, (illegal or not) this is not something you should do anyway.Ask yourself would you want her publishing photos of you on the Internet?I always think that no matter what the circumstances, never do to others what you would not like being done to you.If there is a legitimate reason for you to need to post these photos on the web, you should ask her permission to do this and respect her wishes if she says no.