The Canadian Lesson, or "Lex Canada" post the SWR111 disaster; despite Canada having - at least on the statute books - a total capping of public CVR and/or ATC R/T disclosure, it only took a matter of months if not weeks before the world was able to access, download or by other means listen to the actual voices of those involved as the situation developed.
As Spain is involved, I can only imagine the timescale will in this case be shortened by a power of ten.
Transparency, my rear end!