Add LICENSE file
[litex.git] / LICENSE
1 Migen is free software: you can redistribute it and/or modify it under
2 the terms of the GNU General Public License as published by the Free
3 Software Foundation, version 3 of the License. This program is
4 distributed in the hope that it will be useful, but WITHOUT ANY
5 WARRANTY; without even the implied warranty of MERCHANTABILITY or
6 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
7 more details.
8
9 Additional permissions under section 7 of the GNU General Public License
10 (GPL) are hereby granted. The purpose of this exception is to allow
11 non-GPL (including proprietary) logic cores to be used in conjunction
12 with code generated by Migen in a design.
13
14 "Generated" code refers to Verilog or VHDL code that has been obtained
15 by converting FHDL structures using Migen.
16
17 To "instantiate" is to include and connect another module as specified
18 in section 12.1.2 of the IEEE standard 1364-2001 or in section 9.6 of
19 the IEEE standard 1076-1993.
20
21 (1) You have permission to propagate a work of generated code that
22 instantiates modules that are not generated code and do not comply
23 with the GPL.
24 (2) You have permission to propagate a work of Verilog or VHDL code that
25 is not generated code, does not comply with the GPL and instantiates
26 generated code.
27
28 The availability of this exception does not imply any general
29 presumption that third-party software is unaffected by the copyleft
30 requirements of the license of Migen.
31
32 Unless otherwise noted, Migen's source code is copyright (C) 2011-2012
33 Sebastien Bourdeauducq.
34
35 The simulation extension (as mentioned in the comments at the beginning
36 of the corresponding source files) is copyright (C) 2012 Vermeer
37 Manufacturing Co.
38
39 Other authors retain ownership of their contributions. If a submission
40 can reasonably be considered independently copyrightable, it's yours and
41 I encourage you to claim it with appropriate copyright notices. This
42 submission then falls under the "otherwise noted" category. All
43 submissions must use a license compatible with the GPL and the exception
44 above.