Proprietary license incorrectly detected as `bsd-source-code`

[chinyeungli]

Description

The following proprietary license is detected as bsd-source-code which is incorrect

// Copyright (C) 2020 XYZ, Inc. All rights reserved.
//
// All information contained herein is XYZ confidential.
//
// This software is provided to you pursuant to Software License
// Agreement (SLA) with XYZ Inc ("XYZ"). This software may be
// used only in accordance with the terms of this agreement.
//
// Redistribution and use in source and binary forms, with or without
// modification is strictly prohibited without prior written permission
// from XYZ.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

This is the scan result:

  "files": [
    {
      "path": "proprietary-license",
      "type": "file",
      "detected_license_expression": "bsd-source-code",
      "detected_license_expression_spdx": "BSD-Source-Code",
      "license_detections": [
        {
          "license_expression": "bsd-source-code",
          "detection_log": [
            "unknown-intro-followed-by-match"
          ],
          "matches": [
            {
              "score": 100.0,
              "start_line": 5,
              "end_line": 6,
              "matched_length": 3,
              "match_coverage": 100.0,
              "matcher": "2-aho",
      "license_clues": [],
      "percentage_of_license_text": 73.48,
      "for_license_detections": [
        "bsd_source_code-9c7fc9b6-724b-5eaf-fe83-5726c437540a"
      ],
      "scan_errors": []
    }
  ]

[AyanSinhaMahapatra]

Providing the full detection results here for context:

      "license_detections": [
        {
          "license_expression": "bsd-source-code",
          "detection_log": [
            "unknown-intro-followed-by-match"
          ],
          "matches": [
            {
              "score": 100.0,
              "start_line": 5,
              "end_line": 6,
              "matched_length": 3,
              "match_coverage": 100.0,
              "matcher": "2-aho",
              "license_expression": "unknown-license-reference",
              "rule_identifier": "license-intro_21.RULE",
              "rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/license-intro_21.RULE",
              "matched_text": "// This software is provided to you pursuant to Software License\n// Agreement (SLA) with XYZ Inc (\"XYZ\"). This software may be"
            },
            {
              "score": 69.94,
              "start_line": 9,
              "end_line": 23,
              "matched_length": 130,
              "match_coverage": 82.28,
              "matcher": "3-seq",
              "license_expression": "bsd-source-code",
              "rule_identifier": "bsd-source-code_2.RULE",
              "rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/bsd-source-code_2.RULE",
              "matched_text": "// Redistribution and use in source and binary forms, with or without\n// modification is strictly prohibited without prior written permission\n// from XYZ.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
            }
          ]
        }
      ],
      "license_clues": [],
      "percentage_of_license_text": 73.48,