If the embedded font is not available to the web page for any reason (missing font file, wrong keys in the file, non-support by the web browser), then the second-choice font specification is used, ensuring that the page should be readable even without the intended font.Įmbedded OpenType is a proprietary standard supported exclusively by Internet Explorer but was submitted to the W3C in 2007 as part of CSS3, which was rejected and resubmitted as a standalone submission March 18, 2008. Other copy protection measures used are encryption and a list of "trusted roots" at the source end, and a proprietary decrypting DLL at the receiving end. Subsetting reduces the value of copying, as subsetted fonts will typically omit more than half of the characters. Embedded OpenType includes features to discourage copying.
Simply including fonts in webpages might lead to unrestricted copying of copyrighted font files. The font files are made small in size by use of subsetting (only including the needed characters), and by data compression (LZ compression, part of Agfa's MicroType Express). These font files can be created from existing TrueType font files using Microsoft's Web Embedding Fonts Tool (WEFT), and other proprietary and open source software (see "External links" below). Embedded OpenType ( EOT) fonts are a compact form of OpenType fonts designed by Microsoft for use as embedded fonts on web pages.
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