GFDL-1.1 (19215B)
1Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 2Valid-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only 3Valid-License-Identifier: GFDL-1.1-no-invariants-or-later 4Valid-License-Identifier: GFDL-1.1-no-invariants-only 5SPDX-URL: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html 6Usage-Guide: 7 The GNU Free Documentation License should only be used without 8 Invariant Sections, Front-Cover Texts or Back-Cover Texts. 9 It should not be used for new documents, except when they are 10 part of sections that are already using it (notably, the 11 userspace-api media documentation). 12 To use the license in source code, put the following SPDX tag/value pair 13 into a comment according to the placement guidelines in the licensing 14 rules documentation: 15 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 16 or 17 SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-only 18 or 19 SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 20 or 21 SPDX-License-Identifier: GFDL-1.1-no-invariants-only 22License-Text: 23 GNU Free Documentation License 24 Version 1.1, March 2000 25 26 Copyright (C) 2000 Free Software Foundation, Inc. 27 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 28 Everyone is permitted to copy and distribute verbatim copies 29 of this license document, but changing it is not allowed. 30 31 320. PREAMBLE 33 34The purpose of this License is to make a manual, textbook, or other 35written document "free" in the sense of freedom: to assure everyone 36the effective freedom to copy and redistribute it, with or without 37modifying it, either commercially or noncommercially. Secondarily, 38this License preserves for the author and publisher a way to get 39credit for their work, while not being considered responsible for 40modifications made by others. 41 42This License is a kind of "copyleft", which means that derivative 43works of the document must themselves be free in the same sense. It 44complements the GNU General Public License, which is a copyleft 45license designed for free software. 46 47We have designed this License in order to use it for manuals for free 48software, because free software needs free documentation: a free 49program should come with manuals providing the same freedoms that the 50software does. 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