License `MPL-2.0-no-copyleft-exception` is incorrectly treated as an exception during validation

[bhllamoreaux]

Hello, wanted to report a bug I encountered.

When validating license expressions with MPL-2.0-no-copyleft-exception, the parser throws an error like below:

>>> licensing.parse("MPL-2.0-no-copyleft-exception AND GPL-3.0-only", validate=True, strict=True)
Traceback (most recent call last):
  File "/usr/lib/python3.11/site-packages/license_expression/__init__.py", line 536, in parse
    tokens = list(
             ^^^^^
  File "/usr/lib/python3.11/site-packages/license_expression/__init__.py", line 601, in tokenize
    for token in tokens:
  File "/usr/lib/python3.11/site-packages/license_expression/__init__.py", line 1030, in replace_with_subexpression_by_license_symbol
    raise ParseError(
boolean.boolean.ParseError: A license exception symbol can only be used as an exception in a "WITH exception" statement. for token: "MPL-2.0-no-copyleft-exception"

Despite 'exception' in the license ID, this license is an official SPDX license, and not a license exception. See: https://spdx.org/licenses/MPL-2.0-no-copyleft-exception.html

Thanks!

[DennisClark]

Thanks for reporting this @bhllamoreaux and I concur with your analysis.

License MPL-2.0-no-copyleft-exception updated in DejaCode enterprise and public as follows:

• Set the is_exception indicator to false.
• Set the Assigned Tag "Exceptions" to No.
• Updated the Reference Notes to insert the following comment:
  "This is actually an alternative version of the MPL 2.0 license and not an exception."

@AyanSinhaMahapatra Please synchronize and retest when you have time, thanks.