Password protected PDF file

By jardinier ·
Recently I downloaded and paid for an e-book about Positive Thinking. It is in the form of a PDF file and requires a password to access it. At first the password provided opened the file but after a relatively short period of time, I now get the message: "Wrong Password." I emailed the supplier about this problem and have received no reply.

I now "positively think" that it is some kind of scam and is set so that the password becomes ineffective after X days -- possibly 14 days.

Does anyone have a clue how to bypass the password and open the file?

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Money talks

by jdclyde In reply to Password protected PDF fi ...

How did you pay for this ebook?

Contact them, letting them know you are not getting what you paid for, and have already tried contacting the supplier to resolve it, to no avail.

Stop/reverse the payment and sit back. They will contact you with a password.

I am thinking positively that you will get results... B-)

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And not to do any 'stinkin thinkin' but....

by robo_dev In reply to Money talks

From a security standpoint, PDF password protection can be very tough to crack.

If the password is of sufficient length and strength, and it's a recent version of Acrobat that secured it, your investment in time/tools to recover or reset the password would well exceed the original cost of the document.

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by jdclyde In reply to And not to do any 'stinki ...

Adobe has it's product locked down fairly well.

I wouldn't even attempt a crack on it.

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Have attempted it.....

by robo_dev In reply to Agreed

in order to validate that encrypted pdf payroll advice security was adequate.

Most of the tools are doing a combined dictionary and brute-force crack attempt, with a brute force attempt rate of something like 400,000 tries a second on a fast PC. Brute force times all depend on length and strength of passord.

This known password was eight characters, consisting of uppercase, lowercase, numbers, and special characters. The old brute-force calculator gives 73 years at 400K/sec.

Just for grins, setup a fast PC to see if we could get lucky....after a week I gave up. It had tried something like 180 trillion combinations and did not succeed.

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Have you tried setting the date/time on your pc back?

by 1bn0 In reply to Password protected PDF fi ...

To less than 14 days after you downloaded the file?

That might tell you if your theory is correct.

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'Downloaded & Paid for' ~or~ 'Paid for & Downloaded' ?...

by OldER Mycroft In reply to Password protected PDF fi ...

As the saying goes - it's all in the fine print...

If you've paid for this downloadable PDF, then strictly speaking you are free to download it again whenever you need to in case your download gets damaged.

So - have you tried downloading it again (this time without charge) ?

Your act of having paid should now be held on the site's database.

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An interesting suggestion

by jardinier In reply to 'Downloaded & Paid for' ...

However I don't think it would resolve the problem as I would probaby have to pay again to get a different password.

IN FUTURE if I should ever download such a file I would perhaps convert it to Word format or some such thing. This facility is available with WordPerfect Office X3 which I have on one of my computers.

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by jardinier In reply to Password protected PDF fi ...

Hey guys (and girls if present). I went back to the original email in which my password was sent. Lo and behold I read the following:

"If you copy & paste the password, make sure there's no space at the end."

And guess who was copying and pasting the password with a space at the end. Oui, ?moi-m?me. [That's "myself" if you don't know French]

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