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Yes, the fonts come with Windows, but not with other operating systems.
On MacOS, they are legally available with MS Office installed. On Linux,
they are not available at all.

C-Fonts cannot be legally embedded, although they can be mechanically
embedded (and no one warns you about the legal risks). If you receive a
document which embeds a C-Font, the font may end up being installed on
your system (even if you are not allowed to use it because you do not
own a license). Microsoft can legally pursue the owner of the C-Font

By using C-Fonts, you are therefore producing documents with limited
interoperability, even if you are legally allowed to use them (as you
own a Windows license).

C-Fonts are not interoperable also in technical terms, as they have a
peculiar metric size, which is difficult to emulate. This means that a
document where a C-Font is replaced with another font will be visually
different, to the point that many users will believe that contents are
not the same.

I hope this helps.

On 27/04/2016 20:43, Mike Hall wrote:
On 27/04/2016 13:42, Italo Vignoli wrote:
Several people at TDF have been involved in the decision process and
have contributed specific evidence about ODF and OOXML
I zapped your last message, but I wondered whether it was necessary to
have an MSO licence to use Calibri etc. This windows PC, originally Win
7, now Win 10 has all the MS fonts but has never had MSO installed,
which seems to imply it's Windows rather than Office that brings in the

Italo Vignoli - LibreOffice Marketing & PR
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