Updated the license terms

LICENSE.md

@@ -1,11 +1,15 @@
-nopCommerce Public License Version 3.0 ("NPL")
+# nopCommerce Public License Version 4.0 ("NPL")
 
+nopCommerce open-source edition is licensed under nopCommerce Public License. It's basically a GNU Affero General Public License version 3 (GNU AGPL v3.0) plus the "powered by nopCommerce" text requirement on every single page. The nopCommerce Public License Version 4.0 ("NPL") consists of the GNU AGPL v3.0 License with the Additional Terms below. The original GNU AGPL v3.0 License can be found at: http://opensource.org/licenses/GPL-3.0
 
-nopCommerce open source edition is licensed under nopCommerce Public License. It's basically a GPLv3 License plus the "powered by nopCommerce" text requirement on every single page. The nopCommerce Public License Version 3.0 ("NPL") consists of the GPL3 License with the Additional Terms below. The original GPLv3 License can be found at: http://opensource.org/licenses/GPL-3.0
+**Additional nopCommerce terms:**
 
-Additional nopCommerce terms:
+However, in addition to the other notice obligations, (1) all copies of the Program in Executable and Source Code form must, as a form of attribution of the original author, include on each user interface screen (i) the "powered by nopCommerce" text; and (2) all derivative works and copies of derivative works of the Covered Code in Executable and Source Code form must include on each user interface screen (i) the "powered by nopCommerce" text. In addition, the "powered by nopCommerce" text, as appropriate, must be visible to all users, must appear in each user interface screen, and must be in the same position. When users click on the "powered by nopCommerce" text it must direct them to https://www.nopcommerce.com. This obligation shall also apply to any copies or derivative works. Find more info at https://www.nopcommerce.com/nopcommerce-copyright-removal-key
 
-However, in addition to the other notice obligations, (1) all copies of the Program in Executable and Source Code form must, as a form of attribution of the original author, include on each user interface screen (i) the "powered by nopCommerce" text; and (2) all derivative works and copies of derivative works of the Covered Code in Executable and Source Code form must include on each user interface screen (i) the "powered by nopCommerce" text. In addition, the "powered by nopCommerce" text, as appropriate, must be visible to all users, must appear in each user interface screen, and must be in the same position. When users click on the "powered by nopCommerce" text it must direct them to https://www.nopCommerce.com. This obligation shall also apply to any copies or derivative works. Find more info at https://www.nopcommerce.com/p/1/nopcommerce-copyright-removal-key.aspx
+License page: https://www.nopcommerce.com/license
 
+# Commercial License
 
-License page: https://www.nopcommerce.com/licensev3.aspx
+Independent Software Vendors that want the benefits of embedding nopCommerce software in their commercial applications but do not want to be subject to the nopCommerce Public License ("NPL") and do not want to release the source code for their proprietary applications must purchase a commercial license from the nopCommerce team. Purchasing a commercial license means that the nopCommerce Public License ("NPL") does not apply, and a commercial license includes the assurances that distributors typically find in commercial distribution agreements. If use of nopCommerce under the NPL does not satisfy your organization's legal department you should also enter into a commercial license agreement with the nopCommerce team.
+
+Feel free to contact us for more details - https://www.nopcommerce.com/contact-us