PDF password problem

Hi,
I am developing a application in which I am creating PDF files using PDF specifications given in PDF 1.3. All things are working, for data encryption I am using FlateDecode. Now I have to implement password protection in PDF. I read complete specification regarding this. I want to use standard security handler for this. I implemented this also. I am giving both user and owner password to PDF, but still I am not able to open this file.
For owner password I am using following steps if anyone implemented this please check it and let me know.
For owner password:
1) I gave "jain"
2)after padding it is
jain(¿N^NuŠAd.NVÿú.....¶Ðh>€/.©þ
for padding I used
0x28, 0xBF, 0x4E, 0x5E, 0x4E, 0x75, 0x8A, 0x41,
0x64, 0x00, 0x4E, 0x56, 0xFF, 0xFA, 0x01, 0x08,
0x2E, 0x2E, 0x00, 0xB6, 0xD0, 0x68, 0x3E, 0x80,
0x2F, 0x0C, 0xA9, 0xFE, 0x64, 0x53, 0x69, 0x7A
3)MD5 hash this
output is Qåý†ÜzùÀù 7 Õ¹Î`
4)Get the 5 byte key for rc4 algo
it is Qåý†Ü
5)get the user password "atul"
6) after padding it is atul(¿N^NuŠAd.NVÿú.....¶Ðh>€/.©þ
7)call the rc4 algo as
CryptAcquireContext (&vCryptProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptCreateHash (vCryptProv, CALG_MD5, 0, 0, &vHashObj);
CryptHashData (vHashObj, (unsigned char*)pEncKey, 5, 0);
CryptDeriveKey (vCryptProv, CALG_RC4, vHashObj, CRYPT_EXPORTABLE, &vSessionKey);
CryptEncrypt (vSessionKey, 0, TRUE, 0, (unsigned char*)rawdata, pEncMsgLen, rawdatalen);
8) so final owner entry is
õ¶hÈHWVtMº|émÊöó^g(æO¨&LÃ”MYûÜý—
but I don't know whether it is correct or not, If u can please verify these steps and let me know.

but I think the process for getting owner password is same. then how does it matter ?

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Good day,
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Good day abrieb93050306,
I can understand your concern, however can you please let me know that are you able to open both the PDF files ( the one you converted form excel to pdf & the other pdf that was mailed to you ) individually without using any password?
As it asks for the password, it means that the postal mailed PDF is password protected. You can ask for the password from the sender of the postal mail & then try to combine the files.
Please follow the steps in the provided KB doc.to combine the files : Combine files into single PDF | Adobe Acrobat DC tutorials
This will probably resolve your issue.
Let me know if you still experience any issue.
Regards,
Aadesh

PDF password

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[Thread Locked - please continue to respond to the other duplicate post]

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It seems that everyone asking this question have links from Grand Canyon University which will soon have over a 100,000 online students that all use ebooks that open just fine in Adobe Acrobat on their PCs BUT NOT on the mobile versions of Adobe Acrobat. Whatever allows this on PCs needs to be added to the mobile version soon. We rely on our etextbooks that can ONLY be opened on the PC version of Acrobat. That is ridiculous. I can't believe with all the posts regarding password protected ebooks on this forum....that it hasn't been resolved. No one can give you a link because the ebooks are on a website that needs a password. We can save the books to our harddrives/dropbox... I could send you a copy, but thats it. Surely someone at Adobe knows what the hell is going on and can test the problem out themselves?

How can I remove PDF password?

Hi guys, recently I've got a really annoying problem at work. Some of my PDFs can not be copyed, edited or printed. I know that's because they're secured but how can I remove the password? Any idea to work out the problem?

Hello,
As there is no any C# solution ,I would like to psot some sample codes to achieve this.
using Spire.Pdf;
using Spire.Pdf.Security;
namespace modify_PDF_passwords
class Program
static void Main(string[] args)
//load a encrypted file and decrypt it
String encryptedPdf = @"..\Encrypt.pdf";
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You can also read more from
this article
REGARDS
Today is a gift. That's why it's called the Present!

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hi,
This is with refernece to my earlier post, i can now login as a DBA thry OS authentication.
Re: sys password problem
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Please review the document link sent earlier
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