NV Charter is a renamed version of XCharter, being distributed under the same license below. This notice is also included in the font files themselves for legal reasons.

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Copyright (c) 1989-1992, Bitstream Inc., Cambridge, MA.
Copyright (c) 2009, 2010, 2011, 2012 Andrey V. Panov 
Copyright (c) 2013-2024 Michael Sharpe

This font is an extension of Bitstream Charter, whose original license is reproduced below, as required under the terms of that license. 

The extension (XCharter) provides small caps, oldstyle figures and superior figures in all four styles.

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BITSTREAM LICENSE

You are hereby granted permission under all Bitstream propriety rights
to use, copy, modify, sublicense, sell, and redistribute the 4 Bitstream
Charter (r) Type 1 outline fonts and the 4 Courier Type 1 outline fonts
for any purpose and without restriction; provided, that this notice is
left intact on all copies of such fonts and that Bitstream's trademark
is acknowledged as shown below on all unmodified copies of the 4 Charter
Type 1 fonts.

BITSTREAM CHARTER is a registered trademark of Bitstream Inc.