bevy-dlc 1.1.4

Encrypt and ship your DLC! Create your DLC logic and assets and securely unlock it at runtime with signed licenses (generated using bevy-dlc CLI).

Works with Bevy's asset pipeline.

Features

• Pack assets into encrypted .dlcpack containers
• Sign licenses with Ed25519 (private key embeds the symmetric encryption key)
• Verify signatures at runtime and unlock encrypted content
• Lazy loading of labeled assets (e.g. pack.dlcpack#sprites/player.png)
• Product binding — prevent token reuse across games

Install

Add to your Cargo.toml:

bevy-dlc = "1.1"

To use the CLI tool:

cargo install bevy-dlc

Then bevy-dlc --help for available commands.

Quick Start

Generate a license

bevy-dlc generate -o keys/ my-game expansion_1

This will generate two files in keys/:

• expansion_1.slicense — a secure license token that can be safely embedded in your game binary (e.g. with secure::include_secure_str_aes!()) or stored securely on disk. This token contains the encrypted symmetric key needed to unlock the DLC, but can't be decrypted without the private key.
• expansion_1.pubkey — the public key that your game uses to verify the license and extract the symmetric key to unlock the DLC.

Create a pack

bevy-dlc pack --product my-game expansionA -o dlc -- assets/expansionA

• --product — binds the pack to a product name
• assets/expansionA — directory or file(s) to pack
• expansionA — DLC ID (used in licenses to unlock this pack)
• -o dlc — output path for the generated .dlcpack

This creates expansion_1.dlcpack and prints a signed license token.

Alternatively you can use bevy-dlc generate --help to review how to generate a signed license without packing, or bevy-dlc validate --help to verify it.

[!NOTE] bevy-dlc help <command> for detailed usage of each CLI command.

Load in your app

// <aes-key> can be generated using `bevy-dlc generate --aes-key` or any secure random 32-byte key.
secure::include_secure_str_aes!("example.slicense", "<aes-key>", "example_license");

let dlc_key = DlcKey::public(include_str!("../../example.pubkey")).expect("invalid example pubkey");
let signedlicense = SignedLicense::from(get_example_license());

App::new()
    .add_plugins(DefaultPlugins)
    .add_plugins(DlcPlugin::new(
        Product::from("example"),
        dlc_key,
        signedlicense,
    ))
    .init_asset::<TextAsset>()
    .register_dlc_type::<TextAsset>()
    .add_systems(Startup, startup)
    .add_systems(
        Update,
        show_dlc_content.run_if(is_dlc_loaded("expansionA")),
    )
    .run()

Load assets

Once unlocked, load assets from your pack like normal:

let pack: Handle<DlcPack> = asset_server.load("expansion_1.dlcpack");
let image: Handle<Image> = asset_server.load("expansion_1.dlcpack#sprites/player.png");

Review the examples for a complete example (run with cargo run --manifest-path bevy-dlc-examples/Cargo.toml).

Suggestions and Contributions

Contributions are very welcome! Please open an issue or submit a pull request with any improvements, bug fixes, PERFORMANCE IMPROVEMENTS, or new features.

License

MIT