Slashdot 上面提到使用在文件內 GPL Fonts (像是 PDF 內嵌字形) 可能會使得文件也被迫使用 GPL：Unintended Consequences of Using GPL Fonts。

不過在 FSF 的 FAQ 裡面有提到關於字形使用 GPL 的問題：How does the GPL apply to fonts?，在字形的授權下加上下列文字以避免爭議：

As a special exception, if you create a document which uses this font, and embed this font or unaltered portions of this font into the document, this font does not by itself cause the resulting document to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the document might be covered by the GNU General Public License. If you modify this font, you may extend this exception to your version of the font, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

其實應該努力推廣 LGPL (Lesser General Public License)，…