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<div class="moz-cite-prefix">On 2014-04-30 at 16:23 Levantovsky,
Vladimir wrote:<br>
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<!-- |**|begin egp html banner|**| -->WebFonts WG believes that
WOFF2 compliant encoders should also set this flag to indicate the
fact that a font file was subjected to the lossless transform
(which is similar but not identical to the original MTX) and
suggests to modify the bit 11 description as follows:<o:p></o:p><o:p> </o:p>
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<p class="MsoNormal">“Bit 11: Font data is ‘lossless’ as a
results of having been subjected to optimizing transformation
and/or compression (such as e.g. compression mechanisms
defined by ISO/IEC 14496-18, MicroType Express, WOFF 2.0 or
similar) where the original font functionality and features
are retained but the binary compatibility between input and
output font files is not guaranteed. As a result of the
applied transform, the ‘DSIG’ Table may also be invalidated.”<o:p></o:p></p>
<p class="MsoNormal">I believe this new definition preserves the
original intent of this flag and extends use cases when this
flag setting may be a benefit. It will also provide an
indication that certain transforms may cause Digital Signature
table data be invalidated as a result.<o:p></o:p></p>
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I'm not an expert on digital signatures, but isn't it the case that
by changing bit 11 from 0 to 1 (to indicate the lossless transform)
the DSIG *will* be invalidated? <br>
<br>
In any case (and I suppose this is really a question for the
WebFonts WG) what is a client supposed to believe about a font if it
arrives with Bit 11 set and a signature that doesn't validate?<br>
<br>
Bob<br>
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