Hi pupuliao,

以下幾點簡要說明可以讓你做參考：

1、改寫他人以MIT授權的程式，只要後續散布上保留原專案作者的著作權聲明及免責條款後，可以選用任何一款你覺得適宜的授權方式，也就是說、改用其他的自由開源授權方式，包括GPL-3.0是沒有問題的。

授權轉換的方式可以參照David Wheeler這張表：https://www.dwheeler.com/essays/floss-license-slide.html

只要箭頭的方式是順向，即可轉換下一個授權狀態，所以說：MIT，可轉成BSD 3-clause，BSD 3-clause可轉為Apache-2.0，Apache-2.0可轉為LGPL-3.0，LGPL-3.0可轉為GPL-3.0，依此類推。

2、如果置入授權相關的聲明，一般建議是：

A、「每個重要檔案的檔頭(header file)」都置放一段簡要的聲明，如果是將MIT授權的檔案、改為GPL-3.0授權，那可參考下面這段標示範本（改寫自SFLC提供範本：https://www.softwarefreedom.org/resources/2007/gpl-non-gpl-collaboration.html）：

/*
* Copyright (c) 你的改作年份 你的姓名 <你的信箱@example.net>
*
* This file is free software: you may copy, redistribute and/or modify it
* under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright (c) 前一手的創作年份, 前一手姓名 <前一手信箱@example.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software",
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/

B、將授權條款的全文，寫在專案根目錄下名為「COPYING」的純文字檔（此例中，就是放GPL-3.0的授權條款全文）。

C、將整個專案授權狀態的說明，寫在專案根目錄下名為「LEGAL」或是「README」的純文字檔案裡面。（可參考右列專案的寫法：https://www.openfoundry.org/of/download/fossologyvdi/fossologyvdi1.0/README）

這裡提供一篇文章連結讓你做參考，「自由軟體授權資訊的標示說明與 SPDX」：https://www.openfoundry.org/tw/legal-column-list/8420-license-info-of-floss-and-spdx

希望這些資訊對你有所幫助，有後續問題的話歡迎接續提出來。



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