People should be encouraged to create, but with the knowledge that anything published may be retained by others, and that it can have consequences. No technological measure will prevent people from making personal backups or gaining access to data published under the presumption of secrecy or time-limited availability — even if all the layers of DRM work, the analogue hole will always be there.
Rather, invest in teaching kids how to safely publish under pseudonyms or anonymously if they wish to publish their angst-ridden teenage vampire poetry. You can always abandon your connection to that work that way — even if the work lives on for all the world to see.
> Comparing that to Facebook: […]
You should indeed never upload anything that you might wish to expunge at a later date. You have the right to see an old picture gone from Facebook, but you don't have the means to enforce removing it from your cousin's private backup on their own computer.
Rather, invest in teaching kids how to safely publish under pseudonyms or anonymously if they wish to publish their angst-ridden teenage vampire poetry. You can always abandon your connection to that work that way — even if the work lives on for all the world to see.
> Comparing that to Facebook: […]
You should indeed never upload anything that you might wish to expunge at a later date. You have the right to see an old picture gone from Facebook, but you don't have the means to enforce removing it from your cousin's private backup on their own computer.