add retirement notice

Author: albho

README.md

@@ -321,6 +321,8 @@ For more information about the Java demos go to [demo/java](demo/java/README.md)
 
 ### Unity Demos
 
+> Unity SDKs will no longer be maintained after **December 15, 2025**. If you plan to use the Picovoice Unity SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 To run the Picovoice Unity demo, import the latest [Picovoice Unity package](sdk/unity) into your project, open the PicovoiceDemo scene and hit play. To run on other platforms or in the player, go to _File > Build Settings_, choose your platform and hit the `Build and Run` button.
 
 To browse the demo source go to [demo/unity](demo/unity).
@@ -459,6 +461,8 @@ Open `http://localhost:3000` in your browser to try the demo.
 
 ### Rust Demos
 
+> Rust SDKs will no longer be maintained after **July 15, 2025**. If you plan to use the Picovoice Rust SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 From [demo/rust/micdemo](demo/rust/micdemo) run the following command from the terminal to build and run the mic demo:
 ```console
 cargo run --release -- \
@@ -844,6 +848,8 @@ handle.delete();
 
 ### Unity
 
+> Unity SDKs will no longer be maintained after **December 15, 2025**. If you plan to use the Picovoice Unity SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 Import the latest [Picovoice Unity Package](sdk/unity) into your Unity project.
 
 The SDK provides two APIs:
@@ -1444,6 +1450,8 @@ function App(props) {
 
 ### Rust
 
+> Rust SDKs will no longer be maintained after **July 15, 2025**. If you plan to use the Picovoice Rust SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 To add the picovoice library into your app, add `picovoice` to your app's `Cargo.toml` manifest:
 ```toml
 [dependencies]

demo/rust/README.md

@@ -1,5 +1,7 @@
 # Picovoice Rust Demos
 
+> Rust SDKs will no longer be maintained after **July 15, 2025**. If you plan to use the Picovoice Rust SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 This Rust module contains demos for processing real-time audio (i.e. microphone) and audio files using the Picovoice Platform.
 
 ## Usage

demo/unity/README.md

@@ -1,5 +1,7 @@
 # Picovoice Unity Demo
 
+> Unity SDKs will no longer be maintained after **December 15, 2025**. If you plan to use the Picovoice Unity SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 The Picovoice demo for Unity is a multi-platform demo that runs on:
 
 - Desktop Standalone (Windows, macOS and Linux x86_64)

sdk/rust/README.md

@@ -1,6 +1,9 @@
 # Picovoice SDK for Rust
 
+> Rust SDKs will no longer be maintained after **July 15, 2025**. If you plan to use the Picovoice Rust SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 ## Picovoice
+
 Made in Vancouver, Canada by [Picovoice](https://picovoice.ai)
 
 Picovoice is an end-to-end platform for building voice products on your terms. It enables creating voice experiences

sdk/unity/README.md

@@ -1,5 +1,7 @@
 # Picovoice SDK for Unity
 
+> Unity SDKs will no longer be maintained after **December 15, 2025**. If you plan to use the Picovoice Unity SDK for commercial purposes, please [contact us](https://picovoice.ai/contact/).
+
 # Picovoice
 
 Made in Vancouver, Canada by [Picovoice](https://picovoice.ai)