Web and XML Glossary

The OpenType Font Format is an extension of the TrueType Font Format, adding support for Type 1 font data. The OpenType Font Format was developed jointly by Microsoft and Adobe. As with TrueType fonts, OpenType fonts allow the handling of large glyph sets using Unicode encoding. Such encoding allows broad international support, as well as support for typographic glyph variants. Additionally, OpenType fonts may contain digital signatures, allowing Operating Systems and Browsers to identify the source and integrity of font files, including embedded font files obtained in WWW documents, before using them. Also, font developers can encode embedding restrictions in OpenType fonts, and these restrictions cannot be altered in a font signed by the developer.