Quote:
On a recent 2016 PDF I see this:
....
The font is embedded correctly and prints correctly.
The kerning is not tight like normal Helvetica.
Hi angore,
I only checked the free-to-download US pages from Steiner's site, the earliest of which dates to 2006. As expected, both the oldest as well as the latest pages have fonts embedded, in this case Helvetica. I incorrectly assumed that this would apply to all of his pages without considering that his other pages could have been created farther back in time.
When the PDF standard was first introduced computer storage was expensive and the Internet was slow. In order to keep file sizes small Adobe relied on 14 base fonts always being available. These were the 13 standard fonts guaranteed to be on all Postscript devices (Times, Helvetica and Courier in four different faces and a Symbol font) plus ITC Zapf Dingbats. As not everyone owned a Postscript printer and so as to also support screen displays the 14 base fonts were installed in a private directory alongside early versions of Acrobat Reader.
As file size became less important, and to facilitate document consistency the 14 base fonts were no longer installed with Reader and instead Adobe PDF creation tools embedded the fonts. I don't recall exactly when this change took place but I guess though that it must have been sometime in the early 2000's
This scheme is not 100% foolproof as of course earlier PDF files do not included embedded base 14 fonts, also some commercial fonts are not licensed for embedding (indicated by a flag in the font file), and many 3rd party applications do not necessarily have access to base 14 fonts so are unable to embed them. In these cases if the requested font is not found when viewing the file, Reader will attempt to substitute the font with another with similar metrics (I do recall reading somewhere, and I may be completely wrong here, that for some reason a non-embedded Helvetica will always be substituted with Arial MT even if Helvetica exists on the system used for viewing the PDF file).
Please note, I am open to correction as much of what I wrote above relies on memory from some 16 to 18 years back.
Clive