Merge branch 'main1' into main

LICENSE

@@ -1,19 +1,153 @@
-Apache License  
-Version 2.0, January 2004  
-http://www.apache.org/licenses/
+PolyForm Shield License 1.0.0
 
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+<https://polyformproject.org/licenses/shield/1.0.0>
 
-Copyright 2025 Sohan Rout
+Required Notice: Copyright 2025 Sohan Rout (https://dsavisualizer.in)
 
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
+## Acceptance
 
-    http://www.apache.org/licenses/LICENSE-2.0
+In order to get any license under these terms, you must agree
+to them as both strict obligations and conditions to all
+your licenses.
 
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
+## Copyright License
+
+The licensor grants you a copyright license for the
+software to do everything you might do with the software
+that would otherwise infringe the licensor's copyright
+in it for any permitted purpose. However, you may
+only distribute the software according to Distribution
+License and make changes or new works based on the
+software according to Changes and New Works License.
+
+## Distribution License
+
+The licensor grants you an additional copyright license
+to distribute copies of the software. Your license
+to distribute covers distributing the software with
+changes and new works permitted by Changes and New
+Works License.
+
+## Notices
+
+You must ensure that anyone who gets a copy of any part
+of the software from you also gets a copy of these
+terms or the URL for them above, as well as copies of
+any plain-text lines beginning with `Required Notice:`
+that the licensor provided with the software. For
+example:
+
+> Required Notice: Copyright 2025 Sohan Rout (https://dsavisualizer.in)
+
+## Changes and New Works License
+
+The licensor grants you an additional copyright license
+to make changes and new works based on the software
+for any permitted purpose.
+
+## Patent License
+
+The licensor grants you a patent license for the
+software that covers patent claims the licensor can
+license, or becomes able to license, that you would
+infringe by using the software.
+
+## Noncompete
+
+Any purpose is a permitted purpose, except for providing
+any product that competes with the software or any
+product the licensor or any of its affiliates provides
+using the software.
+
+## Competition
+
+Goods and services compete even when they provide
+functionality through different kinds of interfaces
+or media. Goods and services can compete even when
+provided free of charge. If you market a product as a
+practical substitute for the software or another
+product, it competes with that product, even if you
+market it for a different purpose or context.
+
+## New Products
+
+If you are using the software to provide a product that
+does not compete with the software, but the licensor or
+any of its affiliates brings a new product to market
+that competes with the software and directly
+competes with your product, you may continue to
+distribute your existing products that use the software,
+but you may not create new products that use the
+software.
+
+## Discontinued Products
+
+You may begin using the software to compete with a
+product or service that the licensor or any of its
+affiliates has stopped providing, unless the licensor
+includes a notice of intent to resume providing the
+product or service in the notice or repository
+description.
+
+## Fair Use
+
+You may have "fair use" rights for the software under
+the law. These terms do not limit them.
+
+## No Other Rights
+
+These terms do not allow you to sublicense or transfer
+any of your licenses to anyone else, or prevent the
+licensor from granting licenses to anyone else. These
+terms do not imply any other licenses.
+
+## Patent Defense
+
+If you make any written claim that the software
+infringes or contributes to infringement of any patent,
+your patent license for the software granted under these
+terms ends immediately. If your company makes such a
+claim, your patent license ends immediately for work on
+behalf of your company.
+
+## Violations
+
+The first time you are notified in writing that you
+have violated any of these terms, or done anything with
+the software not covered by your licenses, your licenses
+can nonetheless continue if you come into full compliance
+with these terms, and take practical steps to correct
+past violations, within 32 days of receiving notice.
+Otherwise, all your licenses end immediately.
+
+## No Liability
+
+As far as the law allows, the software comes as is,
+without any warranty or condition, and the licensor
+will not be liable to you for any damages arising out of
+these terms or the use or nature of the software, under
+any kind of legal claim.
+
+## Definitions
+
+The "licensor" is the individual or entity offering
+these terms, and the "software" is the software the
+licensor makes available under these terms.
+
+"You" refers to the individual or entity agreeing to
+these terms.
+
+"Your company" is any legal entity, sole proprietorship,
+or other kind of organization that you work for, plus
+all organizations that have control over, are under the
+control of, or are under common control with that
+organization. Control means ownership of substantially
+all the assets of an entity, or the power to direct its
+management and policies by vote, contract, or otherwise.
+Control can be direct or indirect.
+
+"Your licenses" are all the licenses granted to you for
+the software under these terms.
+
+"Use" means anything you do with the software requiring
+one of your licenses.

NOTICE

@@ -0,0 +1,58 @@
+DSA Visualizer
+Copyright 2025 Sohan Rout
+https://dsavisualizer.in
+
+## License
+
+As of 2026, this project is licensed under the PolyForm Shield License
+1.0.0 (see LICENSE). This is NOT a standard permissive open-source
+license. It allows you to view, run, modify, and self-host this code
+for any purpose EXCEPT to build, launch, or operate a product or
+service that competes with DSA Visualizer. See LICENSE for the full,
+binding terms — this file is a plain-language summary, not a
+substitute for it.
+
+Code obtained from this repository before this NOTICE was added may
+have been distributed under the project's prior Apache License 2.0
+terms; those terms do not carry forward to any new copies, forks, or
+distributions made after this change.
+
+## Brand and content — not licensed at all
+
+Separately from the code license, the following are NOT licensed to
+you under any version of this project's license and remain the sole
+property of Sohan Rout:
+
+  - The "DSA Visualizer" name, wordmark, and logo
+  - The site's color scheme, layout, and visual identity as a
+    distinctive whole
+  - Original written content: blog posts, page copy, marketing copy,
+    FAQ answers, and any other prose
+  - SEO metadata, structured data (JSON-LD), page titles/descriptions,
+    and Open Graph content
+
+You may not republish, mirror, or reuse any of the above — in whole
+or in part, modified or unmodified — under a different identity, on a
+different domain, or in a way that suggests your product is DSA
+Visualizer, is affiliated with it, or is endorsed by Sohan Rout.
+
+## Strict rules for anyone reusing this repository
+
+1. You must retain this NOTICE and the LICENSE file, unmodified, in
+   any copy or fork.
+2. You must not use the DSA Visualizer name, logo, brand colors, or
+   layout in a way likely to cause confusion with the original.
+3. You must not copy blog posts, page copy, or SEO/meta content
+   verbatim or near-verbatim and present it as your own.
+4. You must not build a competing DSA-learning/visualization product
+   using this code, per the Noncompete clause in LICENSE.
+5. Any violation is grounds for a DMCA takedown, hosting-provider
+   abuse report, trademark complaint, and/or legal action, in addition
+   to termination of your license under LICENSE Section "Violations."
+
+## Reporting a violation
+
+If you believe someone has copied this project's code, brand, or
+content in violation of these terms, contact:
+
+  sohanrout84@gmail.com

README.md

@@ -15,7 +15,7 @@
 ---
 
 <p align="center">
-  <img src="https://img.shields.io/badge/License-Apache%202.0-blue.svg" alt="License: Apache 2.0">
+  <img src="https://img.shields.io/badge/License-PolyForm%20Shield%201.0.0-red.svg" alt="License: PolyForm Shield 1.0.0">
 </p>
 <p align="center">
   <p align="left">Product Built Using:</p>
@@ -51,7 +51,16 @@
 
 ## License
 
-Apache 2.0 License — See `LICENSE` for details.
+**PolyForm Shield License 1.0.0** — See [`LICENSE`](./LICENSE) for the full, binding terms.
+
+This is **not** a permissive open-source license. In short:
+
+- ✅ You may view, run, modify, and self-host this code for almost any purpose.
+- ❌ You may **not** use it to build, launch, or operate a product or service that competes with DSA Visualizer.
+- ❌ You may **not** use the "DSA Visualizer" name, logo, brand colors/layout, or original written content (blog posts, page copy, SEO metadata) to represent your project as DSA Visualizer or as affiliated with/endorsed by Sohan Rout — none of that is licensed to you at all, under any circumstance.
+- ✅ You must keep the `LICENSE` and [`NOTICE`](./NOTICE) files intact in any copy or fork.
+
+Violating these terms ends your license immediately (see `LICENSE`) and may result in a DMCA takedown, hosting-provider abuse report, trademark complaint, and/or legal action. Full details and strict rules are in [`NOTICE`](./NOTICE). To report a violation, contact sohanrout2@gmail.com.
 
 # Contribution