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Re:Horrifying PDF Experiments by jahnu on Saturday January 02, 2021 @05:52AM (#25611916)
This is by design and not surprising at all if you read even a tiny bit about PDF. It's in fact the default save method in nearly every PDF capable software. Rewriting the PDF is in fact the less common method. I'm surprised a researcher of PDF would be surprised by that.

However, if you are using a tool like a redaction tool then the software should forbid you from writing in append mode. This was a common error in old PDF apps and perhaps contemporary ones that are new.

Edit for politeness:

My surprise is aimed at the researcher, not you :)

Re:Horrifying PDF Experiments by fckthisguy on Saturday January 02, 2021 @06:10AM (#25611985)
The person you're replying to didn't do the research themselves. They said as much.

They were just sharing something they were surprised by/interested in. I was surprised to read that's how editing PDFs works too.

Re:Horrifying PDF Experiments by jahnu on Saturday January 02, 2021 @06:13AM (#25612002)
Yeah sorry if I'm unclear or misinterpreting. My comment is about the researcher not the person I replied to.

I do agree that it's surprising behaviour to regular users of PDF that it usually maintains a history of sorts. Apps should make this clearer.

Re:Horrifying PDF Experiments by lowkeynthorough on Saturday January 02, 2021 @06:26AM (#25612047)
The researcher probably wasnt surprised, it looks like the person you replied to was surprised. Perhaps i was surprised that you were surprised? :)
Re:Horrifying PDF Experiments by jahnu on Saturday January 02, 2021 @06:40AM (#25612119)
I'm surprised by all these appended suprises revealing a history of surprise :D
Re:Horrifying PDF Experiments by pletnes on Saturday January 02, 2021 @01:20PM (#25614959)
Surprisingly, the researcher might also have been surprised the first time they found out.
Re:Horrifying PDF Experiments by Someone on Saturday January 02, 2021 @07:20AM (#25612311)
“You” is ambiguous in English.

https://www.merriam-webster.com/dictionary/you:

  1. the one or ones being addressed 
  2. ONE sense 2a (which is “being one in particular”)
So, pro tip: in chat-like discussions with strangers such as hacker news, one should prefer saying “one” when using sense 2, even if it sounds a bit archaic (at least to me. Is it?)

Also, when reading a “you” that could be interpreted both ways, do not assume it is used in sense 1.

Re:Horrifying PDF Experiments by pbhjpbhj on Saturday January 02, 2021 @08:32AM (#25612726)
"One" is very archaic, I always fear it will be confusing for non-native speakers, and sound stuck-up to native speakers, and tend to avoid it.
Re:Horrifying PDF Experiments by pc86 on Saturday January 02, 2021 @12:35PM (#25614479)
Where did they say the researcher friend was surprised? Where did they say they were surprised?