Permissive licensing?

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Discussion with JK Weiss, TESCAN:

If LiberTEM was under a permissive license like MIT, it would allow integration in TESCAN's software. That would be of concrete interest for TESCAN.

Since we have a lot of code contributed by a small number of contributors, and we can probably contact a large percentage of our contributors, re-licensing would be a realistic option.

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Assigning to the next milestone to make sure we follow up in a timely manner.

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    install_requires=[
        "numpy", # 3-Clause BSD
        "scipy>=1.4.1", # 3-Clause BSD
        "sparse", # 3-Clause BSD License
        "distributed>=2.19.0", # 3-Clause BSD License
        "dask!=2023.6.1",  # 3-Clause BSD License
        "click", # 3-Clause BSD License
        "tornado>=5", # Apache 2.0
        "matplotlib", # Matplotlib only uses BSD compatible code, and its license is based on the [PSF](https://docs.python.org/3/license.html) license
        "pillow", # Like PIL, Pillow is licensed under the open source HPND License (permissive)
        "h5py", # 3-Clause BSD License
        "psutil", # 3-Clause BSD License
        # https://github.com/LiberTEM/LiberTEM/issues/763
        # https://github.com/LiberTEM/LiberTEM/issues/783
        "numba>=0.51", # BSD 2-Clause "Simplified" License
        "ncempy>=1.10", # !!! GPL-3
        'pywin32!=226;platform_system=="Windows"', # 3-Clause BSD License
        # FIXME pull request #259
        # https://github.com/LiberTEM/LiberTEM/pull/259#discussion_r251877431
        'scikit-image', # 3-Clause BSD License
        'cloudpickle', # 3-Clause BSD License
        'jsonschema', # MIT License
        'scikit-learn', # 3-Clause BSD License
        'tqdm', # MIT "it's complicated" https://github.com/tqdm/tqdm/blob/master/LICENCE
        'threadpoolctl>=3.0', # 3-Clause BSD License
        'nbformat', # 3-Clause BSD License
        'nbconvert', # 3-Clause BSD License
        'autopep8', # MIT License
        'empyre>=0.3.0', # !!! EMPyRe is licensed under [GPLv3](https://iffgit.fz-juelich.de/empyre/empyre/-/blob/master/LICENSE).
        'defusedxml', # Python Software Foundation License (PSFL)
        'typing-extensions',  # Python Software Foundation License
        'opentelemetry-api', # Apache 2.0
        'tblib', # BSD 2-Clause License
        'tomli', # MIT License
        'sparseconverter>=0.3.3', # MIT License
        'numexpr!=2.8.6',  # MIT License
        'jupyter_ui_poll',  # MIT License
        'ipympl',  # 3-Clause BSD License
    ],
    extras_require={
        # NumPy interfacing issue on Win 11, Python 3.10
        # Likely caused by other packages constraining NumPy version to <1.23
        # FIXME recheck later again
        'torch': 'torch<1.12', # 3-Clause BSD License
        # Typing issue in hdbscan, maybe
        # https://github.com/scikit-learn-contrib/hdbscan/issues/600
        # FIXME check if error in tests\test_fullmatch.py persists in a later
        # hdbscan release
        'hdbscan': [ 
            "hdbscan<=0.8.30;( python_version=='3.11' and platform_system=='Windows')", # 3-Clause BSD License
            "hdbscan;( python_version!='3.11' or platform_system!='Windows')",
        ],
        'cupy': 'cupy', # MIT License
        'bqplot': [
            'bqplot', # MIT License
            'bqplot-image-gl', # MIT License
            'ipython'], # 3-Clause BSD License
        'hdf5plugin': 'hdf5plugin', # MIT License It's complicated https://github.com/silx-kit/hdf5plugin/blob/main/LICENSE
        'tracing': [
            'opentelemetry-distro', # Apache 2.0
            'opentelemetry-exporter-otlp', # Apache 2.0
        ],
    },

empyre and ncempy are GPL, the rest is permissive. Looks feasible!

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Discussion with @sk1p: We could use this opportunity to spin out the web GUI and perhaps other parts in separate modules.