Lua Requires Chilkat v11.7.0+

Remove the Password and Encryption from a PDF

See more PDF Protection Examples

Demonstrates the removeEncryption operation, which saves the PDF with no encryption at all: no password, no restrictions. It needs owner rights, so the PDF is loaded with its owner password. As with every Protection operation, the change is applied when the file is written. Lua

local chilkat = require("chilkat")

-- 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 encrypted_user_password.pdf

local pdf = chilkat.Pdf.new()

-- Removing the encryption needs owner rights: load with the owner password.
pdf.owner_password = "owner-secret"
local success = pdf:load_file("qa_data/pdf/encrypted_user_password.pdf")
if not success then
    print(pdf.last_error_text)
    return
end

local json = chilkat.JsonObject.new()
local jsonOut = chilkat.JsonObject.new()
success = pdf:protection("getInfo", json, jsonOut)
if not success then
    print(pdf.last_error_text)
    return
end

print("encrypted, as loaded: " .. tostring(jsonOut:bool_of("loaded.encrypted")))
print("algorithm: " .. jsonOut:string_of("loaded.algorithm"))

success = pdf:protection("removeEncryption", json, jsonOut)
if not success then
    print(pdf.last_error_text)
    return
end

print("will be saved encrypted: " .. tostring(jsonOut:bool_of("pending.encrypted")))

success = pdf:write_file("qa_output/minutes_unprotected.pdf")
if not success then
    print(pdf.last_error_text)
    return
end

-- The result is an ordinary PDF that opens without a password.
local reader = chilkat.Pdf.new()
local info = chilkat.JsonObject.new()
success = reader:pre_load_check("qa_output/minutes_unprotected.pdf", info)
if not success then
    print(reader.last_error_text)
    return
end

print("encrypted: " .. tostring(info:bool_of("encrypted")))
success = reader:load_file("qa_output/minutes_unprotected.pdf")
if not success then
    print(reader.last_error_text)
    return
end

print("pages: " .. reader.num_pages)

-- Sample output:

-- encrypted, as loaded: True
-- algorithm: rc4-128
-- will be saved encrypted: False
-- encrypted: False
-- pages: 1