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all: update for new MIT license On March 23, 2021, Nokia transferred the copyrights in the Plan 9 software to the Plan 9 Foundation, which relicensed them under the MIT license. This commit updates the Plan 9 from User Space license to reflect the new base license. The vast majority of the contributions beyond the base Plan 9 set were by me, many of them explicitly under an MIT license. Those are all under the new MIT license now as well. The port of mk to Unix was taken from Inferno via Vita Nuova and had been made available under GPL, but Vita Nuova has relicensed Inferno under the MIT license as well, to match the new Plan 9 license. Michael Teichgraber contributed src/lib9/zoneinfo.c explicitly under the Lucent Public License but has agreed to change the contribution to the MIT license now used in the rest of the distribution. There remain a few exceptions, most notably fonts. See the root LICENSE file for full details. The only mention of the Lucent Public License in the whole tree now is in the LICENSE file, explaining the history.
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1 Copyright © 2021 Plan 9 Foundation

2 Portions Copyright © 2001-2008 Russ Cox

3 Portions Copyright © 2008-2009 Google Inc.

5 Permission is hereby granted, free of charge, to any person obtaining

6 a copy of this software and associated documentation files (the

7 "Software"), to deal in the Software without restriction, including

8 without limitation the rights to use, copy, modify, merge, publish,

9 distribute, sublicense, and/or sell copies of the Software, and to

10 permit persons to whom the Software is furnished to do so, subject to

11 the following conditions:

13 The above copyright notice and this permission notice shall be

14 included in all copies or substantial portions of the Software.

16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

19 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

20 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

21 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

22 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

24 ===================================================================

26 This software is derived from Plan 9, originally copyright Lucent Technologies

27 and distributed under the Lucent Public License, Version 1.02.

28 Lucent was bought by Alcatel, which was bought by Nokia.

29 On March 23, 2021, Nokia announced the transfer of the Plan 9 copyrights to the

30 Plan 9 Foundation, which in turn relicensed Plan 9 under the the MIT license,

31 reproduced above.

33 There are a few exceptions, noted with LICENSE files in their own directories:

35 The bzip2 program uses the bzip2 license; see src/cmd/bzip2/LICENSE.

37 The fonts from Bigelow and Holmes were licensed only for Plan 9 itself,

38 not for derivatives like Plan 9 from User Space.

40 Plan 9 from User Space arranged a separate agreement with B&H to include

41 the bitmap fonts in the font/luc, font/lucm, font/lucsans, and font/pelm

42 directories. Other bitmap fonts have other licenses. See font/LICENSE.

44 The Lucida Sans Unicode PostScript fonts were licensed from B&H only for Plan 9

45 itself, not derivatives like Plan 9 from User Space. In their place, Plan 9 from

46 User Space provides Luxi Sans, also by B&H but available under a more liberal

47 license, and Deja Vu, a Unicode extension of the Bitstream Vera family of fonts.

48 Luxi Sans is similar to Lucida Sans, but it has no Unicode support.

49 Deja Vu does have good Unicode support.