PureBasic Requires Chilkat v11.7.0+

Remove the Restrictions from a PDF

See more PDF Protection Examples

Demonstrates the removeRestrictions operation, which grants every permission. A PDF that needs a password to open stays encrypted and keeps that password. A PDF with no user password, like the one here, has nothing left to protect and is saved unencrypted, the same as removeEncryption. The operation needs owner rights, so the PDF is loaded with its owner password. PureBasic

IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkPdf.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  This example requires the Chilkat API to have been previously unlocked.
    ;  See Global Unlock Sample for sample code.

    ;  The PDF used in this example is available at no_copy_permission.pdf

    pdf.i = CkPdf::ckCreate()
    If pdf.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ;  This PDF opens without a password, but copying text from it is not permitted.
    ;  Removing the restrictions needs owner rights: load with the owner password.
    CkPdf::setCkOwnerPassword(pdf, "owner-secret")
    success = CkPdf::ckLoadFile(pdf,"qa_data/pdf/no_copy_permission.pdf")
    If success = 0
        Debug CkPdf::ckLastErrorText(pdf)
        CkPdf::ckDispose(pdf)
        ProcedureReturn
    EndIf

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    jsonOut.i = CkJsonObject::ckCreate()
    If jsonOut.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPdf::ckProtection(pdf,"getInfo",json,jsonOut)
    If success = 0
        Debug CkPdf::ckLastErrorText(pdf)
        CkPdf::ckDispose(pdf)
        CkJsonObject::ckDispose(json)
        CkJsonObject::ckDispose(jsonOut)
        ProcedureReturn
    EndIf

    Debug "may copy, before: " + Str(CkJsonObject::ckBoolOf(jsonOut,"loaded.permissions.copy"))
    Debug "password needed to open: " + Str(CkJsonObject::ckBoolOf(jsonOut,"loaded.userPasswordRequired"))

    success = CkPdf::ckProtection(pdf,"removeRestrictions",json,jsonOut)
    If success = 0
        Debug CkPdf::ckLastErrorText(pdf)
        CkPdf::ckDispose(pdf)
        CkJsonObject::ckDispose(json)
        CkJsonObject::ckDispose(jsonOut)
        ProcedureReturn
    EndIf

    ;  With no user password and nothing restricted there is nothing left to protect, so the PDF
    ;  will be saved unencrypted.  A PDF that needs a password to open would stay encrypted and
    ;  keep its password.
    Debug "will be saved encrypted: " + Str(CkJsonObject::ckBoolOf(jsonOut,"pending.encrypted"))

    success = CkPdf::ckWriteFile(pdf,"qa_output/leaflet_unrestricted.pdf")
    If success = 0
        Debug CkPdf::ckLastErrorText(pdf)
        CkPdf::ckDispose(pdf)
        CkJsonObject::ckDispose(json)
        CkJsonObject::ckDispose(jsonOut)
        ProcedureReturn
    EndIf

    ;  Anyone can now extract the text.
    reader.i = CkPdf::ckCreate()
    If reader.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPdf::ckLoadFile(reader,"qa_output/leaflet_unrestricted.pdf")
    If success = 0
        Debug CkPdf::ckLastErrorText(reader)
        CkPdf::ckDispose(pdf)
        CkJsonObject::ckDispose(json)
        CkJsonObject::ckDispose(jsonOut)
        CkPdf::ckDispose(reader)
        ProcedureReturn
    EndIf

    opts.i = CkJsonObject::ckCreate()
    If opts.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    extractOut.i = CkJsonObject::ckCreate()
    If extractOut.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    sb.i = CkStringBuilder::ckCreate()
    If sb.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPdf::ckExtractTextSb(reader,"text",opts,sb,extractOut)
    If success = 0
        Debug CkPdf::ckLastErrorText(reader)
        CkPdf::ckDispose(pdf)
        CkJsonObject::ckDispose(json)
        CkJsonObject::ckDispose(jsonOut)
        CkPdf::ckDispose(reader)
        CkJsonObject::ckDispose(opts)
        CkJsonObject::ckDispose(extractOut)
        CkStringBuilder::ckDispose(sb)
        ProcedureReturn
    EndIf

    Debug "characters extracted: " + Str(CkStringBuilder::ckLength(sb))

    ;  Sample output:

    ;  may copy, before: False
    ;  password needed to open: False
    ;  will be saved encrypted: False
    ;  characters extracted: 216


    CkPdf::ckDispose(pdf)
    CkJsonObject::ckDispose(json)
    CkJsonObject::ckDispose(jsonOut)
    CkPdf::ckDispose(reader)
    CkJsonObject::ckDispose(opts)
    CkJsonObject::ckDispose(extractOut)
    CkStringBuilder::ckDispose(sb)


    ProcedureReturn
EndProcedure