mat2/README.md

```
 _____ _____ _____ ___
|     |  _  |_   _|_  |  Keep you data,
| | | |     | | | |  _|     trash your meta!
|_|_|_|__|__| |_| |___|

```

This software is currently in **beta**, please don't use it for anything
critical.

# Metadata and privacy

Metadata consist of information that characterizes data.
Metadata are used to provide documentation for data products.
In essence, metadata answer who, what, when, where, why, and how about
every facet of the data that are being documented.

Metadata within a file can tell a lot about you.
Cameras record data about when a picture was taken and what
camera was used. Office documents like PDF or Office automatically adds
author and company information to documents and spreadsheets.
Maybe you don't want to disclose those information on the web.

This is precisely the job of MAT2: getting rid, as much as possible, of
metadata.

# Requirements

- `python3-mutagen` for audio support
- `python3-gi-cairo` and `gir1.2-poppler-0.18` for PDF support
- `gir1.2-gdkpixbuf-2.0` for images support
- `libimage-exiftool-perl` for everything else

Please note that MAT2 requires at least Python3.5, meaning that it
doesn't run on [Debian Jessie](https://packages.debian.org/jessie/python3),

# Running the test suite

```bash
$ python3 -m unittest discover -v
```

# How to use MAT2

```bash
usage: mat2 [-h] [-v] [-l] [-s | -L] [files [files ...]]

Metadata anonymisation toolkit 2

positional arguments:
  files

optional arguments:
  -h, --help         show this help message and exit
  -v, --version      show program's version number and exit
  -l, --list         list all supported fileformats
  -s, --show         list all the harmful metadata of a file without removing
                     them
  -L, --lightweight  remove SOME metadata
```

# Notes about detecting metadata

While MAT2 is doing its very best to display metadata when the `--show` flag is
passed, it doesn't mean that a file is clean from any metadata if MAT2 doesn't
show any. There is no reliable way to detect every single possible metadata for
complex file formats.

This is why you shouldn't rely on metadata's presence to decide if your file must
be cleaned or not.

# Related software

- The first iteration of [MAT](https://mat.boum.org)
- [Exiftool](https://sno.phy.queensu.ca/~phil/exiftool/mat)
- [pdf-redact-tools](https://github.com/firstlookmedia/pdf-redact-tools), that
	tries to deal with *printer dots* too.
- [pdfparanoia](https://github.com/kanzure/pdfparanoia), that removes
	watermarks from PDF.

# Contact

If possible, use the [issues system](https://0xacab.org/jvoisin/mat2/issues).
If you think that a more private contact is needed (eg. for reporting security issues),
you can email Julien (jvoisin) Voisin at `julien.voisin+mat@dustri.org`,
using the gpg key `9FCDEE9E1A381F311EA62A7404D041E8171901CC`.

# License

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

Copyright 2018 Julien (jvoisin) Voisin <julien.voisin+mat2@dustri.org>

# Thanks

MAT2 wouldn't exist without:

- the [Google Summer of Code](https://summerofcode.withgoogle.com/);
- the fine people from [Tails]( https://tails.boum.org);
- friends

Many thanks to them!