Which is, of course, a violation of the "agreement" between PDF and
Readers (ignored by everyone, it seems, except Adobe). In
Acrobat/Reader, you need to open with the Owner password in order to
change permissions. Opening with the User password should honor
permissions and not allow changing of permissions.
Marc
On 5/21/2019 9:42 AM, Tilman Hausherr wrote:
Am 17.05.2019 um 09:47 schrieb RJC 2009:
Here is my test program which is trying to disable the printing
option and
protect the document with an owner password.
However, if I use the resultant PDF and run the program again with a
DIFFERENT owner password then it ENABLE the printing option.
Basically I need to disable the printing option in PDF with an owner
password and the printing option cannot be enabled back without using
the
original owner password.
I should have read the text more carefully (and continue reading after
"2.0.5"). This is by design. When you open with the user password then
the file is decrypted and can be manipulated, reencrypted, everything.
The owner password is just an extra so that a software can decide that
you're the owner. That is why there are so many tools on the internet
that allow to change the permissions of PDF files.
Read also this:
https://www.cs.cmu.edu/~dst/Adobe/Gallery/anon21jul01-pdf-encryption.txt
Tilman
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