chore: Update README to clarify repository status (#12595)

README.md

@@ -4,15 +4,27 @@
 
 *[Vaadin](https://vaadin.com) allows you to build modern web apps efficiently in plain Java, without touching low level web technologies.*
 
-This repository contains source code and issue tracking for Vaadin 8 and Vaadin 7, both of which use GWT as the base of client-side implementations. You can find source code and issue tracking for newer, web component based Vaadin versions in [vaadin/platform](https://github.com/vaadin/platform).
+This repository serves as an archive of the source code and issue tracking for Vaadin 8 and Vaadin 7. Both use GWT as the base of client-side implementations. Vaadin 8 includes Vaadin 7 compatibility classes. You can find source code and issue tracking for newer, web component based Vaadin versions in [vaadin/platform](https://github.com/vaadin/platform).
 
-Vaadin 8 includes Vaadin 7 compatibility classes. The source code in this repository is (and will always be) available under Apache License 2.0, but Vaadin Framework 7 and 8 are now being maintained under a closed-source model by the Vaadin Expertise Team. You are free to continue using Vaadin Framework releases up to [8.14.3](https://github.com/vaadin/framework/releases/tag/8.14.3) and [7.7.17](https://github.com/vaadin/framework/releases/tag/7.7.17), and you are free to fork and maintain the framework yourself.
+The code in this repository reflects the state of Vaadin 8.14.3 and Vaadin 7.7.17, the last releases made available under the Apache-2 license, and will be left as-is.
 
-Vaadin 8 open source maintenance ended in February 2022, [extended support](https://vaadin.com/vaadin-8-extended-maintenance) is available until February 2032. Starting with version 8.15.0, Vaadin 8 is subject to CVDLv4.
+## NOTICE
 
-Vaadin 7 open source maintenance ended in Febraury 2019, [extended support](https://vaadin.com/support/vaadin-7-extended-maintenance) is available until February 2029. Starting with version 7.7.18, Vaadin 7 is subject to CVDLv4.
+Starting with versions 7.7.30\* and 8.15.0, no new code is being released here, as development now happens in a private repository. However, releases are being published as courtesy notifications to the users who have subscribed to the release feed of this repository. The source code attached to Github releases in this repository reflects the state of code ***in this respository*** at time of release. It is ***NOT*** the source code of the corresponding Extended Maintenance release.
 
-Starting with Vaadin 8.21.0, Vaadin Framework 8 releases will be made available through a *private Maven repository*. To gain access to this private repository, you can find instructions [here](https://vaadin.com/vaadin-8-extended-maintenance-releases). Vaadin Framework 8 releases will eventually be exclusively available through this private repository, but for the time being artifacts will also be released to Maven Central.
+\* Note: 7.7.17 is the last Apache-2 licensed version, however in the beginning of the transition phase extended maintenance version changes to the 7.7 branch were being made here. In order to be in compliance with the license terms, you are only allowed to use 7.7 code up to [release 7.7.17](https://github.com/vaadin/framework/releases/tag/7.7.17).
+
+## Vaadin Framework has entered extended maintenance
+
+Vaadin Framework 7 and 8 are now being maintained under a closed-source model by the Vaadin Expertise Team. You are free to continue using Vaadin Framework releases up to [8.14.3](https://github.com/vaadin/framework/releases/tag/8.14.3) and [7.7.17](https://github.com/vaadin/framework/releases/tag/7.7.17) as made available through this repository, and you are free to fork and maintain the framework yourself.
+
+* Vaadin 8 open source maintenance ended in February 2022, [extended support](https://vaadin.com/vaadin-8-extended-maintenance) is available until February 2032. Starting with version 8.15.0, Vaadin 8 is subject to commercial Vaadin licenses (CVDLv4 from 8.15.0 onward, VCL-1 from 8.19.0 onward, and VCL-2 starting with 8.21.0). The current license is [Vaadin Commercial License, version 2](https://vaadin.com/commercial-license-and-service-terms).
+
+* Vaadin 7 open source maintenance ended in Febraury 2019, [extended support](https://vaadin.com/support/vaadin-7-extended-maintenance) is available until February 2029. Starting with version 7.7.18, Vaadin 7 is subject to commercial Vaadin licenses (CVDLv4 from 7.7.18 onward, VCL-1 from 7.7.37 onward, and VCL-2 starting with 7.7.41). The current license is [Vaadin Commercial License, version 2](https://vaadin.com/commercial-license-and-service-terms).
+
+Starting with Vaadin 8.21.0 and Vaadin 7.7.41, Vaadin Framework releases will be made available through a *private Maven repository*. To gain access to this private repository, you can find instructions [here](https://vaadin.com/vaadin-8-extended-maintenance-releases). Vaadin Framework releases will eventually be exclusively available through this private repository, but for the time being artifacts will also be released to Maven Central.
+
+In order to get access to extended maintenance Framework source code, [contact sales](https://pages.vaadin.com/contact).
 
 ## Changelog
 
@@ -30,7 +42,6 @@ For known issues within Vaadin framework, see [Issue Tracker](https://github.com
 
 For instructions on how to set up a working environment for developing the Vaadin framework, please visit [Development Instructions](README-DEV.md). Pay special attention to workspace preferences.
 
-
 ## Contributing
 
 As of February 2022, this repository is used for issue tracking. Since we are no longer building releases from this repository, we are no longer accepting pull requests. You may file bug reports here against extended maintenance releases.