In other types of copyright-protected materials, we enforce the copyright law in various ways, which includes not allowing reproduction of the materials involved. However, users of fonts and typeface must use them to publish something. In other words, they will make copies of the copyrighted thing, but that is pefectly OK. Then how do we protect copyright on fonts and typefaces?

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Strictly speaking, this is not about copyright law - at least in North America. Protection of typefaces as intellectual property relies on design patents. There is no copyright in typefaces. BoingBoing had an interesting post on this a while ago. The link to it is below. There have been several proposals that the USA and Canada enact copyright law in this regard, as may be found in Europe. If this interests you further, a 'copyright typeface' Google search will give more information.