[michaelmior]

My understanding is that if you connect with a non-Gmail client or send to a non-Gmail user, the email is just a link to a webpage that enforces the restrictions.

[pletnes]

Printscreen.

Photograph your screen with your phone.

It’s still just a «please don’t print».

[jclos]

It's not meant to stop malicious users, it's meant to stop careless ones. Malicious users will always find a way.