zumime is released under the MIT licence (see LICENSE). Its type registry,
R/sysdata.rda and src/zumime_types.h, is generated by
tools/generate-tables.R from two upstream sources and one hand-maintained
file. tools/table-sources.yaml in the package repository records each
upstream file's URL, retrieval date and SHA-256.

1. The IANA Media Types registry
   https://www.iana.org/assignments/media-types/
   Type names and deprecation notes. IANA and the IETF dedicate their
   protocol registries to the public domain under CC0 1.0 and intend that
   they may be used by any party for any purpose:
   https://www.iana.org/help/licensing-terms

2. Apache httpd's mime.types
   https://github.com/apache/httpd/blob/trunk/docs/conf/mime.types
   Type names and file extensions.
   Copyright The Apache Software Foundation.
   Licensed under the Apache License, Version 2.0:
   https://www.apache.org/licenses/LICENSE-2.0
   The extension table is a derived work of that file. The file carries no
   NOTICE of its own; httpd's NOTICE reads: "Apache HTTP Server. Copyright 2026
   The Apache Software Foundation. This product includes software developed
   at The Apache Software Foundation (https://www.apache.org/)."

3. tools/types.yaml, written for zumime: parents, aliases, the R and
   analytic data formats, and canonical-extension overrides. MIT, as the
   package.

The DEFLATE decoder in src/zumime_inflate.c is adapted from puff.c
version 2.3, Mark Adler's reference inflater in zlib's contrib/puff:
https://github.com/madler/zlib/tree/develop/contrib/puff
Copyright (C) 2002-2013 Mark Adler. It is used under puff's zlib-style
licence, whose notice the file keeps in full. The file marks it as altered:
zumime's version reports errors through a flag instead of longjmp(), reads
through a refillable input and a 32 KiB window, and adds the gzip member
check.

The test suite also carries data from Go's net/http sniff tests (BSD-3-Clause,
The Go Authors) and from file-type (MIT, Sindre Sorhus), used as oracles and
not installed. tests/testthat/COPYRIGHTS holds their notices in full.

Nothing is taken from the GPL-licensed R package 'mime'.