Linux - GeneralThis Linux forum is for general Linux questions and discussion.
If it is Linux Related and doesn't seem to fit in any other forum then this is the place.
Notices
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
i know this is a little out of this forum's topic,
but i was wondering what program is best used
to decrypt protected pdf files.
i've been looking around for far too long
for a free alternative but found none.
i know this is a little out of this forum's topic,
but i was wondering what program is best used
to decrypt protected pdf files.
i've been looking around for far too long
for a free alternative but found none.
can somebody gimme some pointers?
Are you talking about pdf files that have been encrypted with PGP, or
some other encryption program? If so, try gnupg. It's available for download -> http://www.gnupg.org/(en)/download/mirrors.html for free, or course,
and there is a very good README file that you can either read from that
website, or from your comp once you unpack it. Website actually has many
HOW-TO's.
I am at this very moment just getting GnuPG setup on my Slack system to
use with KMail, and also for the purpose of encrypting files that I have
converted to .pdf format. So, maybe in a day or two I can be of more help,
if someone more knowledgable doesn't come along in the meantime.
sorry that my first post about decrypting pdfs wasn't that
clear and complete. I was actually in a hurry.
anyhow, here's my situation:
I have a pdf document that contains a master password.
Since the master password was set by the original author,
i can't copy or edit portions of the doc. Plus, it's impossible for me to look for the author and ask for the password.
I've actually tried several Windows-based apps which are not free, to try to decrypt the doc but all those commercial apps
only let me decrypt halfway thru the doc (which is incredibly annoying!)
So, i was wonderin if there are any Linux apps that i can use to
remove/decrypt the doc's master password.
I've tried searching at sf.net and freshmeat.net, but
nothing came up.
anyone with an app in mind to do just that, do let me know.
You could try some of the console tools such as pdf2ps, pdftops, pdftopbm, etc. I'm affraid I haven't got any protected pdf files so I can't test it out for you.
i've tried using those utils that you suggested.
the problem is, the fonts of the resulting doc
looks horrible.
Speaking of font de-uglification, how do i do that?
p/s -- does anybody know where i can
read up on the internal structure of pdf docs?
i am curious as to how the encryption system works.
pp/s -- i am seriously irritated by this master password
thingy. Commercial packages such as GuaPDF, Advanced PDF
Password Recovery and the likes are really putting me off.
that's why i am eager to know how the whole thing operates
and hopefully to circumvent it.
Originally posted by Daniel Han sorry that my first post about decrypting pdfs wasn't that
clear and complete. I was actually in a hurry.
anyhow, here's my situation:
I have a pdf document that contains a master password.
I would suggest that if you don't get any closer with the wonderful guys in
these forums, contact Adobe. They might not tell you how, but they should
know.
If you can provide some more details about it, maybe one of the guys here in
my city might know how. They don't pay for software - here, they say copyright
means "the right to copy," so they use copy CD's. Someone had to break a
lot of stuff to get them usable. Don't know anything else to tell you.
Originally posted by Daniel Han PS -- Does anybody know where I can read up on the internal structure of pdf docs? I am curious as to how the encryption system works.
Contrary to popular belief, pdf is actually open. I believe it used to stand for Postscript Document Format before it became Portable DF. However, Adobe added many fancy things to it (which is why everyone think that Adobe own it) such as encryption, etc. I would guess that to find out about the inner workings of the encryption process, you'd have to ask Adobe, and probably pay for it and sign a NDA.
Originally posted by Daniel Han pp/s -- i am seriously irritated by this master password
thingy. Commercial packages such as GuaPDF, Advanced PDF
Password Recovery and the likes are really putting me off.
that's why i am eager to know how the whole thing operates
and hopefully to circumvent it.
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.