how to make a photo impossible to download from web? Thank you for answer 
Hello @KlarinetkaSt
This topic has been discussed here:
As mentioned by various users, someone with enough technical knowledge will always be able to download images from a website …
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Or someone with the least technical knowledge will screenshot it.
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Yes! 
Hi - Almost impossible to prevent downloading or grabbing a screenshot, but what you can do is watermark a photo to make it worthless to others or shame them into just not trying.
Dave
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