SECTION 5.8
465
Embed ded Font Programs
/StemV 50
/StemH 75
/Ascent 720
/Descent 0
/Leading 83
>>
endobj
5.8 Embedded Font Programs
A font program can be embedded in a PDF file as data contained in a PDF stream
object. Such a stream object is also called a
font file
by analogy with font programs
that are available from sources external to the consumer application. (See also
Font programs are subject to copyright, and the copyright owner may impose
conditions under which a font program can be used. These permissions are re-
corded either in the font program or as part of a separate license. One of the con-
ditions may be that the font program cannot be embedded, in which case it
should not be incorporated into a PDF file. A font program may allow embed-
ding for the sole purpose of viewing and printing the document but not for creat-
ing new or modified text that uses the font (in either the same document or other
documents). The latter operation would require the user performing the opera-
tion to have a licensed copy of the font program, not a copy extracted from the
PDF file. In the absence of explicit information to the contrary, a PDF consumer
should assume that any embedded font programs are to be used only to view and
print the document and not for any other purposes.
file, depending on the representation of the font program. The key is the name
used in the font descriptor to refer to the font file stream; the subtype is the value
of the
Subtype
key, if present, in the font file stream dictionary. Further details of
specific font program representations are given below.
TABLE 5.23 Embedded font organization for various font types
KEY
SUBTYPE
DESCRIPTION
FontFile
—
Type 1 font program, in the original (noncompact) format described in
Adobe Type 1 Font Format.
This entry can appear in the font descriptor for
a
Type1
or
MMType1
font dictionary.