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[QUOTE="Paul Eggert, post: 2381940"]
Yes.

Possibly the difference in size is because ANSI stripped out the
embedded fonts -- they may not have been as worried or careful about
the exact appearance of the standard on your screen.

I'm not surprised that each PDF copy would differ: this is standard
practice these days, as publishers put in watermarks.  It does raise
the issue about how one knows that one's copy is valid, but I guess
the standards organizations don't care all that much about that issue.

But hundreds of kilobytes' worth of differences?  Wow.

The password may be protecting just some functions: for example,
it could be preventing you from printing or selecting text.

My copy from ISO has no encryption and no restrictions imposed by
Acrobat Reader.  For example, I can select the entire PDF document and
copy the result into an Emacs temporary text buffer for viewing; this
consumes 985607 bytes in the Emacs buffer.

Correct.  My page 1 looks like this:

INTERNATIONAL                         ISO/IEC
        STANDARD                                 9899

Second edition
                                           1999-12-01

=============================================

Programming languages --- C

Langages de programmation --- C

=============================================

ISO   IEC                    Reference number
        logo  logo               ISO/IEC 9899:1999(E)
                                     (C) ISO/IEC 1999

Page 2 has a more-detailed copyright notice at the bottom of the page,
and has the ISO's Geneva address and says "Printed in Switzerland".
Above that it has a PDF disclaimer that says it may contain embedded
typefaces that are licensed from Adobe and 3 lines of legal mumbo
jumbo that say I have to obey Adobe's font licenses and it's not ISO's
fault if I don't.  (Which is fine with me.)
[/QUOTE]

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