🚀 go-pugleaf

%!PS-Adobe-1.0 refers to the 1.0 version of the Document Structuring 
Conventions (which are a series of PostScript language comments used
to delineate structure and identify resources with a PS file), it does
NOT indicate that the document uses version 1.0 of the PostScript language.
Version 1.0 are the DSC found in the back of the old red book.

%!PS-Adobe-2.0 and %!PS-Adobe-2.1 refer to the versions of the DSC that
were released as technical notes through Adobe ISV developer support.
These versions added more comments including color separation, file,
font, setup, paper sizes, PPD support, procset, queries, and requirements 
comments. This version is currently available from our server to those 
parties interested in the historical development of the DSC 8^).

%!PS-Adobe-3.0 is the current version of the DSC. The specification for
v3.0 is found in Appendix G of the PostScript Language Reference Manual,
Second Edition (a.k.a. the new red book). It adds new comments to
support PostScript Level 2, emulations, resources, media, and defaults.
It will be available on our server soon (maybe as v3.1).

As I said before, %!PS-Adobe-X.x does not indicate the level of the PostScript
language that is needed in order to execute the file; the %%LanguageLevel:
comment does this.

Hope this helps, Carl 8^)