License not found for NVD importer

[TG1999]

No description provided.

[Hritik14]

This was an issue in the old model as well It was not present earlier as well: https://github.com/nexB/vulnerablecode/blob/ed2131656b1b3030c2f9eb28e25c10dbbedc8e1d/vulnerabilities/importer_yielder.py#L129-L133

[AyanSinhaMahapatra]

https://www.nist.gov/oism/copyrights is nist-pd, see https://github.com/nexB/scancode-toolkit/blob/ebb55c341bc6ba644d2be0e531ffbfc2948bca47/src/licensedcode/data/licenses/nist-pd.LICENSE and https://github.com/nexB/scancode-toolkit/blob/ebb55c341bc6ba644d2be0e531ffbfc2948bca47/src/licensedcode/data/licenses/nist-pd.yml

[pombredanne]

See https://cve.mitre.org/about/termsofuse.html

Terms of Use
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https://nvd.nist.gov/general/FAQ-Sections/General-FAQs#faqLink7

All NVD data is freely available from our data feeds (https://nvd.nist.gov/vuln/data-feeds). There are no fees, licensing restrictions, or even a requirement to register. All NIST publications are available in the public domain according to Title 17 of the United States Code. Acknowledgment of the NVD when using our information is appreciated. In addition, please email nvd@nist.gov to let us know how the information is being used

We need to check these are detected correctly in ScanCode and use a combination of these two licenses in an expression.