Why did the True Type fonts in my document not get merged and optimized?
Fonts are commonly embedded in a document to make sure that the PDF can be rendered on any platform. The fonts travel with the PDF, so the file will open and display properly whether the same fonts are installed on the local machine or not. PDF documents are often created with multiple copies of the same font. When there are multiple copies of the same font, they may be merged into a single font.
But sometimes font files that would otherwise appear to be compatible can’t be merged, and it is difficult to determine that before processing a PDF document. For example, PDF Optimizer will not be able to merge different True Type fonts using the same name.