diff --git a/LICENSE-BUSL.txt b/LICENSE-BUSL.txt
new file mode 100644
index 0000000..0c8b895
--- /dev/null
+++ b/LICENSE-BUSL.txt
@@ -0,0 +1,102 @@
+Business Source License 1.1
+
+Parameters
+
+Licensor: Iván Montiel Cardona
+Licensed Work: AVR8Sharp BUSL-1.1 components — Avr8Sharp.TestKit and
+ Avr8Sharp.TestKit.Core.
+ (The Avr8Sharp simulator core is licensed separately under
+ MIT; it is a port of the avr8js library, © Uri Shaked.)
+ The Licensed Work is © 2025-2026 Iván Montiel Cardona.
+Additional Use Grant: You may copy, modify, redistribute, and make production use of
+ the Licensed Work free of charge for any purpose that is not a
+ Commercial Use.
+
+ "Commercial Use" means either:
+ (a) using the Licensed Work in an automated build, test,
+ continuous-integration, or continuous-delivery (CI/CD)
+ system that is operated by or on behalf of a for-profit
+ organization; or
+ (b) using or incorporating the Licensed Work in the
+ development, testing, distribution, or operation of any
+ product or service that generates, or is intended to
+ generate, commercial revenue.
+
+ Use by individuals, and use for personal, hobby, educational,
+ academic-research, evaluation, or open-source purposes, is never
+ a Commercial Use and is always permitted free of charge.
+
+ Commercial Use requires a separate commercial license from the
+ Licensor.
+Change Date: 2030-07-08
+Change License: MIT
+
+For information about alternative licensing arrangements for the Licensed Work,
+please contact the Licensor.
+
+-----------------------------------------------------------------------------
+
+Terms
+
+The Licensor hereby grants you the right to copy, modify, create derivative
+works, redistribute, and make non-production use of the Licensed Work. The
+Licensor may make an Additional Use Grant, above, permitting limited production
+use.
+
+Effective on the Change Date, or the fourth anniversary of the first publicly
+available distribution of a specific version of the Licensed Work under this
+License, whichever comes first, the Licensor hereby grants you rights under the
+terms of the Change License, and the rights granted in the paragraph above
+terminate.
+
+If your use of the Licensed Work does not comply with the requirements currently
+in effect as described in this License, you must purchase a commercial license
+from the Licensor, its affiliated entities, or authorized resellers, or you must
+refrain from using the Licensed Work.
+
+All copies of the original and modified Licensed Work, and derivative works of
+the Licensed Work, are subject to this License. This License applies separately
+for each version of the Licensed Work and the Change Date may vary for each
+version of the Licensed Work released by Licensor.
+
+You must conspicuously display this License on each original or modified copy of
+the Licensed Work. If you receive the Licensed Work in original or modified form
+from a third party, the terms and conditions set forth in this License apply to
+your use of that work.
+
+Any use of the Licensed Work in violation of this License will automatically
+terminate your rights under this License for the current and all other versions
+of the Licensed Work.
+
+This License does not grant you any right in any trademark or logo of Licensor or
+its affiliates (provided that you may use a trademark or logo of Licensor as
+expressly required by this License).
+
+TO THE EXTENT PERMITTED BY APPLICABLE LAW, THE LICENSED WORK IS PROVIDED ON AN
+"AS IS" BASIS. LICENSOR HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS
+OR IMPLIED, INCLUDING (WITHOUT LIMITATION) WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, AND TITLE.
+
+MariaDB hereby grants you permission to use this License's text to license your
+works, and to refer to it using the trademark "Business Source License", as long
+as you comply with the Covenants of Licensor below.
+
+Covenants of Licensor
+
+In consideration of the right to use this License's text and the "Business Source
+License" name and trademark, Licensor covenants to MariaDB, and to all other
+recipients of the licensed work to be provided by Licensor:
+
+1. To specify as the Change License the GPL Version 2.0 or any later version, or
+ a license that is compatible with GPL Version 2.0 or a later version, where
+ "compatible" means that software provided under the Change License can be
+ included in a program with software provided under GPL Version 2.0 or a later
+ version. Licensor may specify additional Change Licenses without limitation.
+
+2. To either: (a) specify an additional grant of rights to use that does not
+ impose any additional restriction on the right granted in this License, as the
+ Additional Use Grant; or (b) insert the text "None".
+
+3. To specify a Change Date.
+
+4. Not to modify this License in any other way.
diff --git a/src/Avr8Sharp.TestKit.Core/Avr8Sharp.TestKit.Core.csproj b/src/Avr8Sharp.TestKit.Core/Avr8Sharp.TestKit.Core.csproj
index 9701cbc..a87a150 100644
--- a/src/Avr8Sharp.TestKit.Core/Avr8Sharp.TestKit.Core.csproj
+++ b/src/Avr8Sharp.TestKit.Core/Avr8Sharp.TestKit.Core.csproj
@@ -18,8 +18,11 @@
Copyright (c) Iván Montiel
https://github.com/begeistert/avr8sharp
Arduino;AVR;Simulator;Testing
- MIT
- 1.1.0-beta4
+
+
+ LICENSE-BUSL.txt
+ 1.1.0-beta5
https://github.com/begeistert/avr8sharp
Iván Montiel
README.md
@@ -27,6 +30,7 @@
+
diff --git a/src/Avr8Sharp.TestKit/Avr8Sharp.TestKit.csproj b/src/Avr8Sharp.TestKit/Avr8Sharp.TestKit.csproj
index dda1c22..b9ad2bb 100644
--- a/src/Avr8Sharp.TestKit/Avr8Sharp.TestKit.csproj
+++ b/src/Avr8Sharp.TestKit/Avr8Sharp.TestKit.csproj
@@ -13,8 +13,11 @@
Copyright (c) Iván Montiel
https://github.com/begeistert/avr8sharp
Arduino;AVR;Simulator;Testing;FluentAssertions
- MIT
- 1.1.0-beta4
+
+
+ LICENSE-BUSL.txt
+ 1.1.0-beta5
https://github.com/begeistert/avr8sharp
Iván Montiel
README.md
@@ -34,6 +37,7 @@
+
diff --git a/src/Avr8Sharp/Avr8Sharp.csproj b/src/Avr8Sharp/Avr8Sharp.csproj
index 54dac84..4308c80 100644
--- a/src/Avr8Sharp/Avr8Sharp.csproj
+++ b/src/Avr8Sharp/Avr8Sharp.csproj
@@ -15,7 +15,7 @@
https://github.com/begeistert/avr8sharp
Arduino;AVR;Simulator
MIT
- 1.1.0-beta4
+ 1.1.0-beta5
https://github.com/begeistert/avr8sharp
Iván Montiel
README.md