[libreoffice-users] Problems with document metadata

Hello Libreoffice Team,

I have learned about metadata-induced privacy leak issue previously, and have been accustomed to 
wiping every file of metadata after final edition. A few days ago I encountered an accidentally 
unbleached odt file when aimlessly scanning my disk with exiftool, and I was shocked to find a line 
titled "generator", in a format just like, "LibreOffice/[Libreoffice version]$[OS and arch] 
LibreOffice_project/[a long string made up of numbers and letters]".

I am worried, since while usually keeping the cleaning habit, I had the concept that as a free 
software known for privacy-focus, libreoffice documents would not contain any telemetry or 
sensitive data by default. However this time, I could not get rid of this generator line even with 
"Apply User Data" tickbox unchecked, and at last I had to ask to violent means such as mat2. So, 
after some googles in vain, I would appreciate it if someone could tell me what does this [a long 
string made up of numbers and letters] means, and if this line contains anything like a hardware 
identifier or such.

Eager for your early reply.

Sincerely Yours
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