[Cthulhu_]

That's up to you - what techniques do you know that allows you to process personal data which ensures it's secure? It's a law, not a specification or an implementation detail.

More general, it's difficult to understand because it's in legalese, which is aimed at people that studied it for years - it's the English programming language. And like code, there's lots of holes in it that it doesn't cover, despite lots of manyears of effort.