[Fix] Fix liscense of SegFormer (open-mmlab#1699)

* [Fix] Fix liscense of SegFormer

* add liscense

* add liscense

LICENSES.md

@@ -0,0 +1,7 @@
+# Licenses for special operations
+
+In this file, we list the features with other licenses instead of Apache 2.0. Users should be careful about adopting these features in any commercial matters.
+
+| Operation |                                                                        Files                                                                        |                            License                            |
+| :-------: | :-------------------------------------------------------------------------------------------------------------------------------------------------: | :-----------------------------------------------------------: |
+| SegFormer | [mmseg/models/decode_heads/segformer_head.py](https://github.com/open-mmlab/mmsegmentation/blob/master/mmseg/models/decode_heads/segformer_head.py) | [NVIDIA License](https://github.com/NVlabs/SegFormer#license) |

README.md

@@ -204,7 +204,7 @@ If you find this project useful in your research, please consider cite:
 
 ## License
 
-This project is released under the [Apache 2.0 license](LICENSE).
+MMSegmentation is released under the Apache 2.0 license, while some specific features in this library are with other licenses. Please refer to [LICENSES.md](LICENSES.md) for the careful check, if you are using our code for commercial matters.
 
 ## Projects in OpenMMLab
 

README_zh-CN.md

@@ -198,7 +198,7 @@ MMSegmentation 是一个由来自不同高校和企业的研发人员共同参
 
 ## 开源许可证
 
-该项目采用 [Apache 2.0 开源许可证](LICENSE)。
+`MMSegmentation` 目前以 Apache 2.0 的许可证发布，但是其中有一部分功能并不是使用的 Apache2.0 许可证，我们在 [许可证](LICENSES.md) 中详细地列出了这些功能以及他们对应的许可证，如果您正在从事盈利性活动，请谨慎参考此文档。
 
 ## OpenMMLab 的其他项目
 

mmseg/models/decode_heads/segformer_head.py

@@ -1,4 +1,82 @@
-# Copyright (c) OpenMMLab. All rights reserved.
+# Modified from
+# https://github.com/NVlabs/SegFormer/blob/master/mmseg/models/decode_heads/segformer_head.py
+#
+# This work is licensed under the NVIDIA Source Code License.
+#
+# Copyright (c) 2021, NVIDIA Corporation. All rights reserved.
+# NVIDIA Source Code License for StyleGAN2 with Adaptive Discriminator
+# Augmentation (ADA)
+#
+#  1. Definitions
+#  "Licensor" means any person or entity that distributes its Work.
+#  "Software" means the original work of authorship made available under
+# this License.
+#  "Work" means the Software and any additions to or derivative works of
+# the Software that are made available under this License.
+#  The terms "reproduce," "reproduction," "derivative works," and
+# "distribution" have the meaning as provided under U.S. copyright law;
+# provided, however, that for the purposes of this License, derivative
+# works shall not include works that remain separable from, or merely
+# link (or bind by name) to the interfaces of, the Work.
+#  Works, including the Software, are "made available" under this License
+# by including in or with the Work either (a) a copyright notice
+# referencing the applicability of this License to the Work, or (b) a
+# copy of this License.
+#  2. License Grants
+#      2.1 Copyright Grant. Subject to the terms and conditions of this
+#     License, each Licensor grants to you a perpetual, worldwide,
+#     non-exclusive, royalty-free, copyright license to reproduce,
+#     prepare derivative works of, publicly display, publicly perform,
+#     sublicense and distribute its Work and any resulting derivative
+#     works in any form.
+#  3. Limitations
+#      3.1 Redistribution. You may reproduce or distribute the Work only
+#     if (a) you do so under this License, (b) you include a complete
+#     copy of this License with your distribution, and (c) you retain
+#     without modification any copyright, patent, trademark, or
+#     attribution notices that are present in the Work.
+#      3.2 Derivative Works. You may specify that additional or different
+#     terms apply to the use, reproduction, and distribution of your
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+#     derivative works, and (b) you identify the specific derivative
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+#     as necessary to reproduce the notices described in this License.
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+#  4. Disclaimer of Warranty.
+#  THE WORK IS PROVIDED "AS IS" WITHOUT WARRANTIES OR CONDITIONS OF ANY
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+# THIS LICENSE.
+#  5. Limitation of Liability.
+#  EXCEPT AS PROHIBITED BY APPLICABLE LAW, IN NO EVENT AND UNDER NO LEGAL
+# THEORY, WHETHER IN TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE
+# SHALL ANY LICENSOR BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY DIRECT,
+# INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
+# OR RELATED TO THIS LICENSE, THE USE OR INABILITY TO USE THE WORK
+# (INCLUDING BUT NOT LIMITED TO LOSS OF GOODWILL, BUSINESS INTERRUPTION,
+# LOST PROFITS OR DATA, COMPUTER FAILURE OR MALFUNCTION, OR ANY OTHER
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+# THE POSSIBILITY OF SUCH DAMAGES.
+
 import torch
 import torch.nn as nn
 from mmcv.cnn import ConvModule