LICENSE

FIXED-POINT MP3 ENCODER - LICENSE AGREEMENT

Copyright (C) 1998-2025 Mark Phillips. All rights reserved.

ORIGINAL CODE ATTRIBUTION

This software incorporates MP3 encoder code originally developed by Segher
Boessenkool and acquired through Interactive Objects, Inc. and FullPlay Media
Systems, Inc. (1998-2001). The original encoder provided the foundational MP3
encoding algorithms which were subsequently optimized for embedded systems.

Original development contributions:

- Segher Boessenkool: Core fixed-point MP3 encoding algorithm
- Interactive Objects, Inc.: Embedded platform integration
- FullPlay Media Systems, Inc.: Commercial deployment optimization

All source code assets, intellectual property rights, and commercial rights
were acquired by Mark Phillips and further developed for modern platforms.

The original encoder source code served as the reference implementation for:

- Fixed-point MDCT (Modified Discrete Cosine Transform)
- Polyphase analysis filter bank
- Psychoacoustic model for perceptual encoding
- Huffman encoding and bitstream formatting
- Bit reservoir management

All modern platform adaptations (LP64 compatibility, ARM64 optimization,
sanitizer compliance) were developed by Mark Phillips (2025).

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NON-COMMERCIAL USE LICENSE
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GRANT OF LICENSE

Subject to the terms and conditions of this license, Mark Phillips ("Licensor")
grants you a limited, non-exclusive, non-transferable, revocable license to
use this software solely for personal, educational, and non-commercial research
purposes.

RESTRICTIONS

1. COMMERCIAL USE PROHIBITED

   You may NOT use this software, in whole or in part, for any commercial
   purpose, including but not limited to:

   - Incorporation into commercial products or services
   - Use in revenue-generating applications or websites
   - Distribution as part of commercial software packages
   - Use in commercial media production or processing services
   - Deployment in commercial embedded systems or devices

   Commercial use requires a separate commercial license agreement with
   the copyright holder.

2. NO REDISTRIBUTION

   You may NOT:

   - Redistribute this software in source or binary form
   - Make this software available for download
   - Include this software in software distributions or repositories
   - Share compiled binaries or executables derived from this software

   Each user must obtain the software directly from the authorized source.

3. NO DERIVATIVE WORKS FOR COMMERCIAL USE

   While you may modify this software for personal use, you may NOT:

   - Create derivative works for commercial purposes
   - Distribute modified versions of this software
   - Use modified versions in commercial products or services
   - Sublicense any derivative works

4. ATTRIBUTION REQUIRED

   Any permitted use must retain:

   - All copyright notices
   - This license text
   - Attribution to original authors
   - Links to the original repository (if distributed with permission)

PERMITTED USES

You MAY use this software for:

- Personal MP3 encoding and audio file conversion
- Educational instruction and coursework
- Academic research and publications (with proper citation)
- Non-commercial software development and testing
- Historical preservation and archival purposes
- Technical evaluation and code review
- Embedded systems research and prototyping

INTELLECTUAL PROPERTY

This software and all associated intellectual property rights remain the
exclusive property of Mark Phillips. This license does not grant you any
ownership rights to the software.

The MP3 audio coding technology may be protected by patents held by third
parties. This license does not grant any patent rights. You are responsible
for obtaining any necessary patent licenses for your use.

Note: Core MP3 patents expired in 2017, but territorial variations may apply.

DISCLAIMER OF WARRANTY

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NONINFRINGEMENT.

THE COPYRIGHT HOLDER MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
SUITABILITY, RELIABILITY, AVAILABILITY, ACCURACY, OR COMPLETENESS OF THIS
SOFTWARE.

LIMITATION OF LIABILITY

IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES, OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE,
ARISING FROM, OUT OF, OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

THIS INCLUDES, BUT IS NOT LIMITED TO:

- Direct, indirect, incidental, or consequential damages
- Loss of profits, revenue, or business opportunities
- Loss of data or system downtime
- Cost of substitute goods or services

TERMINATION

This license is effective until terminated. Your rights under this license
will terminate automatically without notice if you fail to comply with any
of its terms. Upon termination, you must destroy all copies of the software
in your possession.

COMMERCIAL LICENSE INQUIRIES

For commercial licensing, custom development, or permission to redistribute,
please contact Mark Phillips through the repository.

GOVERNING LAW

This license shall be governed by and construed in accordance with the laws
of the jurisdiction in which the copyright holder resides, without regard to
its conflict of law provisions.

ENTIRE AGREEMENT

This license constitutes the entire agreement between you and the copyright
holder regarding the use of this software and supersedes all prior agreements
and understandings, whether written or oral.

SEVERABILITY

If any provision of this license is held to be unenforceable or invalid, that
provision will be enforced to the maximum extent possible, and the other
provisions will remain in full force and effect.

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By using this software, you acknowledge that you have read this license,
understand it, and agree to be bound by its terms and conditions.

Last Updated: January 2, 2026