I am using pdfparser to parse and read text from pdfs on PHP. It works fine for some pdf files. But, for some files it throws an error saying: 'Secured pdf file are currently not supported.'. When I try to open the files that pdfparser says are secure, using a pdf reader like Adobe, I can open them without any problem.
I have tried few approaches like using file_get_contents and file_put_contents to save the files again to check if they might work, but to no avail. Is there any solution to parse and read the text from these files? Any solution is greatly appreciated.
A file can be encrypted, but have a default user password. This allows you to open the PDF file but (with conforming software) does not allow you to change the permissions. A separate owner password is required to change the permissions.
So it's entirely possible to have a PDF file which is secured with an owner password but has no user password, which a PDF consumer which supports encrypted files can open, but is still nevertheless encrypted and cannot be opened by a consumer which does not support encryption.
As Magnus suggested above you could use a different PDF consumer, or you could contribute encrypted PDF support to pdfparser.