And make it abundantly clear to everyone that you’re not suicidal. Record videos with date stamps. Send date stamped letters by mail to friends, with instructions to retain the letters indefinitely, and perhaps which are clearly marked “to be opened in the event of my death”. The letters should say something along the lines of “I am not suicidal. I do not want to die. I am not going to kill myself under any circumstances. If I die, it was not by suicide. I want to live. I have ABC reasons to live. I have XYZ plans for the future.” Etc.
Keep multiple copies of the information in multiple locations, and make sure multiple people know where a copy is. Ideally, have a dead-man’s switch set up, or someone you trust to do it, to automatically send all the information to all the major news outlets if you do turn up dead, along with a statement akin to the letter outlined above to make it clear you were murdered.
Pleasing the copyright holders. I don’t know how it is for the Dutch national library, but with a system used by many libraries in the US there’s a cost to the library based on the number of times it’s checked out, so more revenue for the copyright holder and the digital middle man. Allowing you to have the e-book indefinitely would be, at least in their minds, no different than giving it away. 🤷