[somat]

What a ridiculous law, smells of some sort of frog boiling scheme to me.

step1: "lets see if we can get away with imposing a small easy requirement, you know 'think of the children'"

step2: "now that we have a foot in the door, lets see if we can get some real tracking in place, for the children of course"

Anyhow: as far as I can tell compliance on linux would be as simple as

    echo $YEAR_BORN > ~/.config/ca_ab_1043

It's an accessible interface(it is the same user interface many linux programs use), applications can use a well known api to access the data.(using the common unix filesystem interface) and it only presents the minimum needed information to the application.

[ThatPlayer]

The requested info is age range, not actual year born. So that's actually giving too much info, and could be breaking the law. Especially because 18+ is a completely valid range.