是否可以商用？

开源代码是否可以商用，其实是要看源代码的开源许可证，如果源代码对应的开源许可证是支持免费商用，当然可以用，但是一定要遵循其规定

如下部分许可证总结：

转自：https://www.ruanyifeng.com/blog/2011/05/how_to_choose_free_software_licenses.html

更多许可证：

常用开源协议以及是否能够商用：https://www.zhangbj.com/p/833.html

如何查看许可证是哪个？

找到其源码，阅读其源码仓库中的 LICENSE 文件

如果是 Apache License ，便可以商用，但是要遵循其规定。

什么是 Apache License 2.0 ？

Apache License 2.0协议来自于著名的Apache基金会，其最重要的开源软件就是Apache（HTTPD）网站服务器。

Apache License协议和BSD类似，同样鼓励代码共享和尊重原作者的著作权，同样允许代码修改，再发布（作为开源或商业软件）。需要满足的条件也和BSD类似：

需要给代码的用户一份Apache Licence
如果你修改了代码，需要在被修改的文件中说明
在延伸的代码中（修改和有源代码衍生的代码中）需要带有原来代码中的协议，商标，专利声明和其他原来作者规定需要包含的说明。
如果再发布的产品中包含一个Notice文件，则在Notice文件中需要带有Apache Licence。你可以在Notice中增加自己的许可，但不可以表现为对Apache Licence构成更改。

Apache Licence也是对商业应用友好的许可。使用者也可以在需要的时候修改代码来满足需要并作为开源或商业产品发布/销售。著名的Android系统，Apache基金会的众多开源项目，Swift项目等，都是用Apache Lincese 2.0协议。

使用Apache Licence 2.0协议的好处是:

永久权利，一旦被授权，永久拥有。
全球范围的权利，在一个国家获得授权，适用于所有国家。假如你在美国，许可是从印度授权的，也没有问题。
授权免费无版税，前期、后期均无任何费用。
授权无排他性，任何人都可以获得授权
授权不可撤消，一旦获得授权，没有任何人可以取消。比如，你基于该产品代码开发了衍生产品，你不用担心会在某一天被禁止使用该代码。

转自：什么是Apache License 2.0开源协议：https://www.cnblogs.com/cqiuku/p/14857890.html

如何使用开源代码？

1、根路径添加 LICENSE 文件

内容如下：

Apache LicenseVersion 2.0, June 2018http://www.apache.org/licenses/TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION1. Definitions."License" shall mean the terms and conditions for use, reproduction,and distribution as defined by Sections 1 through 9 of this document."Licensor" shall mean the copyright owner or entity authorized bythe copyright owner that is granting the License."Legal Entity" shall mean the union of the acting entity and allother entities that control, are controlled by, or are under commoncontrol with that entity. For the purposes of this definition,"control" means (i) the power, direct or indirect, to cause thedirection or management of such entity, whether by contract orotherwise, or (ii) ownership of fifty percent (50%) or more of theoutstanding shares, or (iii) beneficial ownership of such entity."You" (or "Your") shall mean an individual or Legal Entityexercising permissions granted by this License."Source" form shall mean the preferred form for making modifications,including but not limited to software source code, documentationsource, and configuration files."Object" form shall mean any form resulting from mechanicaltransformation or translation of a Source form, including butnot limited to compiled object code, generated documentation,and conversions to other media types."Work" shall mean the work of authorship, whether in Source orObject form, made available under the License, as indicated by acopyright notice that is included in or attached to the work(an example is provided in the Appendix below)."Derivative Works" shall mean any work, whether in Source or Objectform, that is based on (or derived from) the Work and for which theeditorial revisions, annotations, elaborations, or other modificationsrepresent, as a whole, an original work of authorship. For the purposesof this License, Derivative Works shall not include works that remainseparable from, or merely link (or bind by name) to the interfaces of,the Work and Derivative Works thereof."Contribution" shall mean any work of authorship, includingthe original version of the Work and any modifications or additionsto that Work or Derivative Works thereof, that is intentionallysubmitted to Licensor for inclusion in the Work by the copyright owneror by an individual or Legal Entity authorized to submit on behalf ofthe copyright owner. 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If Youinstitute patent litigation against any entity (including across-claim or counterclaim in a lawsuit) alleging that the Workor a Contribution incorporated within the Work constitutes director contributory patent infringement, then any patent licensesgranted to You under this License for that Work shall terminateas of the date such litigation is filed.4. Redistribution. You may reproduce and distribute copies of theWork or Derivative Works thereof in any medium, with or withoutmodifications, and in Source or Object form, provided that Youmeet the following conditions:(a) You must give any other recipients of the Work orDerivative Works a copy of this License; and(b) You must cause any modified files to carry prominent noticesstating that You changed the files; and(c) You must retain, in the Source form of any Derivative Worksthat You distribute, all copyright, patent, trademark, andattribution notices from the Source form of the Work,excluding those notices that do not pertain to any part ofthe Derivative Works; and(d) If the Work includes a "NOTICE" text file as part of itsdistribution, then any Derivative Works that You distribute mustinclude a readable copy of the attribution notices containedwithin such NOTICE file, excluding those notices that do notpertain to any part of the Derivative Works, in at least oneof the following places: within a NOTICE text file distributedas part of the Derivative Works; within the Source form ordocumentation, if provided along with the Derivative Works; or,within a display generated by the Derivative Works, if andwherever such third-party notices normally appear. The contentsof the NOTICE file are for informational purposes only anddo not modify the License. You may add Your own attributionnotices within Derivative Works that You distribute, alongsideor as an addendum to the NOTICE text from the Work, providedthat such additional attribution notices cannot be construedas modifying the License.You may add Your own copyright statement to Your modifications andmay provide additional or different license terms and conditionsfor use, reproduction, or distribution of Your modifications, orfor any such Derivative Works as a whole, provided Your use,reproduction, and distribution of the Work otherwise complies withthe conditions stated in this License.5. Submission of Contributions. Unless You explicitly state otherwise,any Contribution intentionally submitted for inclusion in the Workby You to the Licensor shall be under the terms and conditions ofthis License, without any additional terms or conditions.Notwithstanding the above, nothing herein shall supersede or modifythe terms of any separate license agreement you may have executedwith Licensor regarding such Contributions.6. Trademarks. This License does not grant permission to use the tradenames, trademarks, service marks, or product names of the Licensor,except as required for reasonable and customary use in describing theorigin of the Work and reproducing the content of the NOTICE file.7. Disclaimer of Warranty. Unless required by applicable law oragreed to in writing, Licensor provides the Work (and eachContributor provides its Contributions) on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express orimplied, including, without limitation, any warranties or conditionsof TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR APARTICULAR PURPOSE. You are solely responsible for determining theappropriateness of using or redistributing the Work and assume anyrisks associated with Your exercise of permissions under this License.8. Limitation of Liability. In no event and under no legal theory,whether in tort (including negligence), contract, or otherwise,unless required by applicable law (such as deliberate and grosslynegligent acts) or agreed to in writing, shall any Contributor beliable to You for damages, including any direct, indirect, special,incidental, or consequential damages of any character arising as aresult of this License or out of the use or inability to use theWork (including but not limited to damages for loss of goodwill,work stoppage, computer failure or malfunction, or any and allother commercial damages or losses), even if such Contributorhas been advised of the possibility of such damages.9. Accepting Warranty or Additional Liability. While redistributingthe Work or Derivative Works thereof, You may choose to offer,and charge a fee for, acceptance of support, warranty, indemnity,or other liability obligations and/or rights consistent with thisLicense. However, in accepting such obligations, You may act onlyon Your own behalf and on Your sole responsibility, not on behalfof any other Contributor, and only if You agree to indemnify,defend, and hold each Contributor harmless for any liabilityincurred by, or claims asserted against, such Contributor by reasonof your accepting any such warranty or additional liability.END OF TERMS AND CONDITIONSAPPENDIX: How to apply the Apache License to your work.To apply the Apache License to your work, attach the followingboilerplate notice, with the fields enclosed by brackets "[]"replaced with your own identifying information. (Don't includethe brackets!)  The text should be enclosed in the appropriatecomment syntax for the file format. We also recommend that afile or class name and description of purpose be included on thesame "printed page" as the copyright notice for easieridentification within third-party archives.Copyright 2018 Huang JinQunLicensed under the Apache License, Version 2.0 (the "License");you may not use this file except in compliance with the License.You may obtain a copy of the License athttp://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.See the License for the specific language governing permissions andlimitations under the License.

2、根路径添加 NOTICE 文件

我看一般开源项目里都没有这个文件，大家自行判断吧

用于记录第三方库

Apache SkyWalking
Copyright 2017-2020 The Apache Software FoundationThis product includes software developed at
The Apache Software Foundation (http://www.apache.org/).

「Apache SkyWalking Copyright 2017-2020 The Apache Software Foundation」
对应的是第三方库：
Apache SkyWalking ：作者或者机构
Copyright
2017-2020
The Apache Software Foundation：项目

「This product includes software developed at The Apache Software Foundation (http://www.apache.org/).」

如上内容固定

3、在使用的地方（放在文件最上面）

 Copyright 2019, hegaojian(何高建)       Licensed under the Apache License, Version 2.0 (the "License");you may not use this file except in compliance with the License.You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, softwaredistributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.See the License for the specific language governing permissions andlimitations under the License.

如果修改了源代码，需要在源代码内进行说明

参考地址

使用开源项目必须保留作者姓名？开源软件不能商用？我们需要先学会分辨开源许可证：https://zhuanlan.zhihu.com/p/368237701

开源协议：在项目中使用Apache License 2.0：https://blog.csdn.net/liumiaocn/article/details/107363838

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每天记录学习的新知识：开源代码是否可以商用在项目中？

开源代码是否可以商用？