Taking a photo of a minor is not a crime, if by "webcam" you are
implying that they are nude. Then yes, it can fall under
transmission of Child Pornography and Possession of Child
Pornography.
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Porn between adults over the age of majority is generally legal in Israel. Child pornography is explicitly illegal.
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Yes, if they include child pornography.
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Child pornography is a pictures or videos of sexual/naked
photos/videos of children. It is highly illegal.