Document that MAT2 not being able to detect metadata doesn't mean that the file is clean
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README.md
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README.md
@ -44,7 +44,7 @@ $ python3 -m unittest discover -v
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# How to use MAT2
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```bash
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usage: mat2 [-h] [-v] [-l] [-c | -s | -L] [files [files ...]]
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usage: mat2 [-h] [-v] [-l] [-s | -L] [files [files ...]]
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Metadata anonymisation toolkit 2
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@ -55,15 +55,24 @@ optional arguments:
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-h, --help show this help message and exit
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-v, --version show program's version number and exit
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-l, --list list all supported fileformats
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-c, --check check if a file is free of harmful metadatas
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-s, --show list all the harmful metadata of a file without removing
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them
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-L, --lightweight remove SOME metadata
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```
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# Notes about detecting metadata
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While MAT2 is doing its very best to display metadata when the `--show` flag is
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passed, it doesn't mean that a file is clean from any metadata if MAT2 doesn't
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show any. There is no reliable way to detect every single possible metadata for
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complex file formats.
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This is why you shouldn't rely on metadata's presence to decide if your file must
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be cleaned or not.
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# Related software
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- The first iteration of [MAT](http://mat.boum.org)
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- The first iteration of [MAT](https://mat.boum.org)
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- [Exiftool](https://sno.phy.queensu.ca/~phil/exiftool/mat)
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- [pdf-redact-tools](https://github.com/firstlookmedia/pdf-redact-tools), that
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tries to deal with *printer dots* too.
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