Document LGPL licensing for BC Math functions

- Add LGPL-2.1 exception section to LICENSE file
- Add License section to README with BC Math note
- Add SPDX identifier and clearer notice to _bc.js
- Remove scripts/verify-php.js (duplicate of src/_util infrastructure)
- Remove scripts/ from biome excludes

Addresses #473

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kvz

LICENSE

@@ -1,3 +1,5 @@
+MIT License
+
 Copyright (c) 2007-2024 Kevin van Zonneveld (https://kvz.io) and Contributors (https://locutus.io/authors)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
@@ -12,3 +14,13 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 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.
+
+---
+
+LGPL-2.1 Exception
+
+The BC Math functions (src/php/_helpers/_bc.js, src/php/bc/*) are derived from PHP's bcmath extension and Libbcmath,
+which are licensed under LGPL-2.1. These files retain their original LGPL-2.1 license. If you use these functions,
+LGPL-2.1 terms apply to that portion of your project.
+
+If LGPL is a concern, simply avoid importing from `locutus/php/bc/`.

README.md

@@ -22,6 +22,7 @@ Use our creations at your own risk, and may they inspire you to push the boundar
 - [Install](#install)
 - [Use](#use)
 - [Development](#development)
+- [License](#license)
 
 ## Install
 
@@ -64,3 +65,7 @@ true
 ## Development
 
 Some guidelines and instructions can be found in [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## License
+
+MIT, except for `src/php/bc/` and `src/php/_helpers/_bc.js` which are LGPL-2.1 (derived from PHP's bcmath/Libbcmath). See [LICENSE](LICENSE) for details.

biome.json

@@ -12,8 +12,7 @@
       "!website",
       "!dist",
       "!node_modules",
-      "!.yarn",
-      "!scripts"
+      "!.yarn"
     ]
   },
   "formatter": {

scripts/verify-php.js

@@ -1,3 +1,7 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// NOTE: This file is LGPL licensed, not MIT like the rest of locutus.
+// See LICENSE file for details.
+
 module.exports = function _bc() {
   //  discuss at: https://locutus.io/php/_helpers/_bc
   // original by: lmeyrick (https://sourceforge.net/projects/bcmath-js/)
@@ -7,7 +11,7 @@ module.exports = function _bc() {
   //   returns 1: '+'
 
   /**
-   * BC Math Library for Javascript
+   * BC Math Library for Javascript (LGPL-2.1)
    * Ported from the PHP5 bcmath extension source code,
    * which uses the Libbcmath package...
    *    Copyright (C) 1991, 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
@@ -21,10 +25,9 @@ module.exports = function _bc() {
    *               Western Washington University
    *               Bellingham, WA 98226-9062
    *
-   * bcmath-js homepage:
+   * bcmath-js homepage: https://sourceforge.net/projects/bcmath-js/
    *
-   * This code is covered under the LGPL licence, and can be used however you want :)
-   * Be kind and share any decent code changes.
+   * This code is covered under the LGPL-2.1 license.
    */
 
   /**