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A particularly important basic set of fonts that became an early standard in digital printing was the Core Font Set included in the PostScript printing system developed by Apple and Adobe. To avoid paying licensing fees for this set, many computer companies commissioned "metrically-compatible" knock-off fonts with the same spacing, which could be used to display the same document without it seeming clearly different. Arial and Century Gothic are notable examples of this, being functional equivalents to the PostScript standard fonts Helvetica and ITC Avant Garde respectively.      Some of these sets were created in order to be freely redistributable, for example Red Hat 's Liberation fonts and Google's Croscore fonts , which duplicate the PostScript set and other common fonts used in Microsoft software such as Calibri .  It is not a requirement that a metrically compatible design be identical to its origin in appearance apart from width.