``` _____ _____ _____ ___ | | _ |_ _|_ | Keep your 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 - `gir1.2-rsvg-2.0` for svg support - `FFmpeg`, optionally, for video support - `libimage-exiftool-perl` for everything else - `bubblewrap`, optionally, for sandboxing 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 ``` And if you want to see the coverage: ```bash $ python3-coverage run --branch -m unittest discover -s tests/ $ python3-coverage report --include -m --include /libmat2/*' ``` # How to use MAT2 ```bash usage: mat2 [-h] [-v] [-l] [--check-dependencies] [-V] [--unknown-members policy] [-s | -L] [files [files ...]] Metadata anonymisation toolkit 2 positional arguments: files the files to process 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 --check-dependencies check if MAT2 has all the dependencies it needs -V, --verbose show more verbose status information --unknown-members policy how to handle unknown members of archive-style files (policy should be one of: abort, omit, keep) [Default: abort] -s, --show list harmful metadata detectable by MAT2 without removing them -L, --lightweight remove SOME metadata ``` Note that MAT2 **will not** clean files in-place, but will produce, for example, with a file named "myfile.png" a cleaned version named "myfile.cleaned.png". # 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. # Notes about the lightweight mode By default, mat2 might alter a bit the data of your files, in order to remove as much metadata as possible. For example, texts in PDF might not be selectable anymore, compressed images might get compressed again, … Since some users might be willing to trade some metadata's presence in exchange of the guarantee that mat2 won't modify the data of their files, there is the `-L` flag that precisely does that. # 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. - [Scrambled Exif](https://f-droid.org/packages/com.jarsilio.android.scrambledeggsif/), an open-source Android application to remove metadata from pictures. # Contact If possible, use the [issues system](https://0xacab.org/jvoisin/mat2/issues) or the [mailing list](https://mailman.boum.org/listinfo/mat-dev) Should a more private contact be needed (eg. for reporting security issues), you can email Julien (jvoisin) Voisin at `julien.voisin+mat2@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 . Copyright 2018 Julien (jvoisin) Voisin Copyright 2016 Marie Rose for MAT2's logo # 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!