PZN-7 and PZN-8 — format provenance and usability
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This file records the engineering provenance and redistribution boundary for
the PZN (Pharmazentralnummer) implementation shipped by Sythos Barcode
Universal.

It is an engineering inventory, not legal advice. Patent, copyright and
trademark conclusions still need independent review for the jurisdiction and
the intended product. Items marked [TO VERIFY] remain open questions.


FORMAT AND IMPLEMENTATION BASIS
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PZN-7 and PZN-8 are German pharmaceutical identifiers carried here in a
Code 39-shaped symbol. The writer accepts a six- or seven-digit body, computes
the corresponding modulo-11 check digit (rejecting the reserved value ten),
and emits the documented leading hyphen and check character. The reader first
validates the complete Code 39 carrier and then validates the PZN check digit;
it reports the detected PZN-7 or PZN-8 variant instead of guessing from a
partial payload.

The runtime is original Sythos TypeScript with generated JavaScript output and
is distributed under the MIT License. The names PZN, Pharmazentralnummer and
Code 39 are used descriptively and do not imply certification, sponsorship or
endorsement by a registry owner or standards organisation.


PATENT AND TRADEMARK REVIEW
---------------------------

Historical pharmaceutical-label patents, national patent families and current
registrations for PZN or related marks have not been independently cleared
here. [TO VERIFY] This project makes no unconditional patent-free,
public-domain or trademark-clearance claim.


INDEPENDENT VALIDATION BOUNDARY
-------------------------------

BWIPP/bwip-js was used only as a local, independent black-box oracle to compare
rendered PZN-7 and PZN-8 symbols. Its source, tables and runtime are not copied
into or shipped by this SDK, and it is not a runtime dependency. The comparison
is an engineering check, not a legal opinion or a conformance certificate.


CONCLUSION
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The original Sythos PZN implementation is MIT-licensed. If a rights holder or
user identifies a conflicting notice about the available material, please open
a GitHub issue with the reference so it can be reviewed and recorded.