up-side

Point is that preventing copying like this works just fine in most cases. Especially if you know (like in the example I gave) that you're not allowed to try to circumvent it. This is like a 'soft DRM' function. Pretty easy to circumvent, but that's no problem. Inconvenient is good enough here.

Anyway, you think the functionality is useless. I think it has it's usecases. You should ask Adobe why they wrote it, and the companies using it why they do that, not me.