Blame LICENSE

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  pemagination: a (virtual) tour into portable bits and executable bytes
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  Copyright (C) 2013--2020  Z. Gilboa
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  This library is currently released under the GPLv2 and GPLv3 (see
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  COPYING.PEMAGINE for the relevant text). If you wish to use this
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  library with a different license, please contact the author
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  at <writeonce at midipix dot org> and briefly describe the type
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  of license (or license exception) that you would like to obtain.