如何在BSD 3-clause库的源文件中正确呈现多兼容许可证？

Nice job getting your base license setup right first—having the full LICENSE.txt at root and consistent headers for original files is a great foundation. Let’s tackle the foo.cpp scenario, since you’re dealing with derived code from two BSD 3-Clause projects (PCL and OpenCV), which simplifies things a lot because the licenses are fully compatible.

You don’t need to paste the full text of PCL’s and OpenCV’s BSD licenses into your file header—this would create unnecessary redundancy, and the BSD 3-Clause only requires you to retain original copyright notices, a pointer to the license, and the disclaimer (though since your project uses the same license, the disclaimer aligns). Here’s the clean, compliant approach:

Recommended foo.cpp Header Template #

/* This file is part of <your project name>, developed by <you>. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be found in the LICENSE.txt file.
 *
 * This file incorporates modified code derived from the following open-source projects:
 * - Point Cloud Library (PCL):
 *   Copyright (c) 2009-2024 The PCL Contributors
 *   Licensed under the BSD 3-Clause License
 * - OpenCV:
 *   Copyright (c) 2000-2024 Intel Corporation, Willow Garage, Inc., and OpenCV Contributors
 *   Licensed under the BSD 3-Clause License
 */

Key Details to Note: #

• Retain your original header: Keep your project’s core attribution first—this makes clear who maintains the current version of the file.
• Specific copyright info: Use the exact copyright holders and year ranges from the original PCL/OpenCV files you adapted. For example, if you pulled code from a PCL file with a 2012-2023 copyright line, use that instead of the full project range.
• No full license text needed: Since all three projects use BSD 3-Clause, referencing the license type is sufficient. Users can access the original projects’ full licenses via their respective repositories, and your root LICENSE.txt covers your project’s terms.
• If you modified specific lines: If you copied a small snippet with a unique copyright line (e.g., a function written by a specific contributor), include that line directly in the attribution section for precision.

Why This Works: #

BSD 3-Clause’s core requirements for derived works are:

1. Retain the original copyright notice
2. Retain the license notice (or a clear reference to it)
3. Retain the disclaimer of warranty

Since your project’s LICENSE.txt already includes the BSD 3-Clause disclaimer, and you’re explicitly attributing the original code sources with their copyright and license type, you meet all compliance requirements without cluttering your file header.

内容的提问来源于stack exchange，提问作者svenevs