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 Doesn’t sound secure to me. 

Do you need the document or is knowing the number enough? 
 It is not secure. 

You need the document at times.  
 This is my personal nightmare. What if your house burns down with the document inside? Can it be easily reissued? 
 You can, but gosh it's a pain in the balls.  
 I can imagine. Ah, modernity. The gift that keeps on giving. 
 Yeah. It's just dumb all around.