Thank you my good man.

I have the same problem with this with smart phones.
I have signs in my gallery but every now and again I catch people and have to explain that it is not allowed. I politely say that they can buy a post card of the work if they like it so much but as you say people get offended.
I blame the internet itself.
An entire generation has grown up with the ease of "copy and paste" and this has become so common place that they just think it is OK. Downloading music, films, photographs, artwork etc is seen as a if it their right.
I think blockchain technology might help but not in daily life galleries.
This is why I came up with the idea of having secrets bits in my paintings.
Cheers, always good to hear your interesting comments.