2.1.34 Part 1 Section 15.2.12, Font Part
a. The standard states that fonts are stored in one of two formats: application/x-fontdata and application/x-font-ttf, which does not account for the obfuscation in WordprocessingML documents.
Word stores obfuscated fonts using the following content type: application/vnd.openxmlformats-officedocument.obfuscatedFont. application/vnd.openxmlformats-officedocument.obfuscatedFont specifies that the font shall be stored in the TrueType or OpenType format and shall be obfuscated using the algorithm specified by Font Embedding ("[ECMA-376] Part 4 §2.8.1; Font Embedding"). Only WordprocessingML is permitted to reference obfuscated fonts.
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This note applies to the following products: 2007, 2007 SP1, 2007 SP2.
b. The standard states that application/x-font-ttf specifies that the font shall be stored in the TrueType or OpenType format.
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PowerPoint does not use this content type. Word reads these fonts if the value of the fontKey attribute is equal to 00000000-0000-0000-0000-000000000000.
c. The standard states that application/x-fontdata specifies that the font shall be stored as a bitmapped font (each glyph is stored as a raster image).
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PowerPoint stores TrueType and OpenType fonts ([Embed-Open-Type-Format], [Micro-Type-Exp-Format]) in parts of this type. Word does not read or write this content type.