Alternatively, you can license the OpenType versions from Adobe, Helvetica Std, and change your content to use those fonts. Such fonts are not licensed directly on anymore, but they can be licensed through Linotype and other font vendors. Helvetica Type 1 font is one of the original Base 13 fonts from PostScript. Regardless of whether a font is embedded in a PDF file, Illustrator requires that any fonts referenced in an Illustrator PDF file must be installed on your system the embedded font is never used by Illustrator. (Note that except for content placed via links, Illustrator only supports either CMYK or RGB, not any mixture of same.) Otherwise, although Illustrator does attempt to provide editing services for the PDF, there are some constructs that are not part of Illustrator's document model. When that option is specified, the real Adobe Illustrator format is saved as private data within the PDF file and it is that private data which is used for the editing, not the actual PDF text. The only PDF files that Adobe Illustrator can very reliably edit are PDF files saved from either the same or earlier version of Adobe Illustrator using the editability option. First of all, please note that Adobe Illustrator is not, repeat not, repeat yet once again not a general purpose PDF file editor.
