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Lock & Block SecurityMinecraft mod for 1.21.1

Adds fun and creative security features to protect your stuff

client and servernewest supported release 1.21.1TechnologyDecoration
Latest version
0.10.2+1.21.1
Minecraft
1.20.1 to 1.21.1
Java
Java 21+
Loader
Fabric
Licence
GPL-3.0-only
Downloads
93.1k
Updated
1 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Lock & Block Security servers

One click and Lock & Block Security is installed with the right loader, on hardware built for it.

  • 1.21.1
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Lock & Block Security declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric21+declared8 Aug 2024
1.20.1Fabric17+declared12 Jun 2023

Download

From Lock & Block Security’s own host. Nothing is re-hosted here.

Most recently published release

0.10.2+1.21.1release3 Oct 2026

LockAndBlock-0.10.2+1.21.1.jar · 0.4 MB · for 1.21.1 · Fabric

Download this release
d39815838a5d…
Older versions17
  • 0.10.2+1.20.13 Oct 20261.20.10.4 MB63edfb2687ee…Get
  • 0.10.1+1.20.118 Jan 20261.20.10.4 MB12.5k downloads45ad4dc05cc3…Get
  • 0.10.1+1.21.118 Jan 20261.21.10.4 MB8.6k downloads6abc2c3797e0…Get
  • 0.10.016 Jan 20261.21.10.4 MB249 downloads3901e0769b01…Get
  • 0.9.011 Aug 20251.20.10.4 MB10.9k downloads46907dfcc29b…Get
  • 0.8.023 May 20251.20.10.4 MB36.6k downloads42fb2ce677bb…Get
  • 0.7.111 Apr 20251.20.10.4 MB2.1k downloads987d41a60e8a…Get
  • 0.7.09 Apr 20251.20.10.4 MB154 downloadsd65299bd3be3…Get
  • 0.6.123 Oct 20241.20.10.3 MB6.0k downloads621e0bb0f34f…Get
  • 0.6.06 Jun 20241.20.10.3 MB4.2k downloads5a0435da53d7…Get
  • 0.5.14 Jun 20241.20.10.3 MB116 downloads8f48fa662f5c…Get
  • 0.5.04 Jun 20241.20.10.3 MB97 downloads739d43f2482f…Get
  • 0.4.126 May 20241.20.10.2 MB577 downloads04eed2f17758…Get
  • 0.4.025 May 20241.20.10.2 MB103 downloads71def3c871f1…Get
  • 0.3.025 May 20241.20.10.1 MB121 downloadsbd0d39e73952…Get
  • 0.2.023 May 20241.20.10.1 MB92 downloads621bf5cc94bb…Get
  • 0.1.023 May 20241.20.182 KB173 downloadsb7ec0d7a681a…Get

Dependencies

What Lock & Block Securitydeclares it needs, from the author’s own release metadata. A required one has to be installed alongside it or it will not load.

Fabric APIRequired. Lightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.oωo (owo-lib)Required. A general utility, GUI and config library for modding on Fabric and QuiltLavenderRequired. A Guidebook API and alternative to Patchouli

Frequently asked

Does Lock & Block Security work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Lock & Block Security declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Lock & Block Security support?

Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Lock & Block Security on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Lock & Block Security support?

Fabric. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Lock & Block Security?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What does Lock & Block Security need to run?

It declares Fabric API, oωo (owo-lib) and Lavender as required, so those have to be installed alongside it or it will not load. Each one is linked in the dependencies section above.

What licence is Lock & Block Security under?

GPL-3.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Lock & Block Security?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Lock & Block Security safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

GeckoLibA 3D animation library for entities, blocks, items, armor, and more!BookshelfAn open source library for other mods!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Details from Modrinth, where the author last updated it on 3 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .