Zig 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. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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

    const pdf = try chilkat.Pdf.init();
    defer pdf.deinit();

    // Removing the encryption needs owner rights: load with the owner password.
    pdf.setOwnerPassword("owner-secret");
    pdf.loadFile("qa_data/pdf/encrypted_user_password.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    const json_out = try chilkat.JsonObject.init();
    defer json_out.deinit();
    pdf.protection("getInfo", json, json_out) catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("encrypted, as loaded: {}\n", .{json_out.boolOf("loaded.encrypted")});
    std.debug.print("algorithm: {s}\n", .{try json_out.stringOf(alloc, "loaded.algorithm")});

    pdf.protection("removeEncryption", json, json_out) catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("will be saved encrypted: {}\n", .{json_out.boolOf("pending.encrypted")});

    pdf.writeFile("qa_output/minutes_unprotected.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    // The result is an ordinary PDF that opens without a password.
    const reader = try chilkat.Pdf.init();
    defer reader.deinit();
    const info = try chilkat.JsonObject.init();
    defer info.deinit();
    reader.preLoadCheck("qa_output/minutes_unprotected.pdf", info) catch {
        std.debug.print("{s}\n", .{try reader.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("encrypted: {}\n", .{info.boolOf("encrypted")});
    reader.loadFile("qa_output/minutes_unprotected.pdf") catch {
        std.debug.print("{s}\n", .{try reader.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("pages: {d}\n", .{reader.getNumPages()});

    // Sample output:

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