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You can restrict access to your generated document using the following rules. The encryption is made in 128bits.
Some PDF Reader don’t make the distinction between user and owner in a PDF Document. This means that when the user password has been entered, some PDF reader ignore the restrictions (no print, no copy, etc).
So, setting a blank password for the user is similar to no security.
ParameterTypeDefaultDescription
authorStringnullDocument’s author name
user_passwordStringnullA user who has the password will be able to view the document and perform operations allowed by the permission options
owner_passwordStringnullA user who has the password will have unlimited access to the PDF, including changing the passwords and permission options.
no_printBooleanfalseWhen set to true, printing will be disabled.
no_copyBooleanfalseWhen set to true, the possibility to copy any text will be disabled.
no_modifyBooleanfalseWhen set to true, the possibility to modify the document will be disabled.