diff --git a/2026/06/2026-06-30-ltspice-simulator.md b/2026/06/2026-06-30-ltspice-simulator.md new file mode 100644 index 0000000000..2a2cb6c98a --- /dev/null +++ b/2026/06/2026-06-30-ltspice-simulator.md @@ -0,0 +1,88 @@ +Before disabling any content in relation to this takedown notice, GitHub +- contacted the owners of the affected repositories to give them an opportunity to [make changes](https://docs.github.com/en/github/site-policy/dmca-takedown-policy#a-how-does-this-actually-work). +- provided information on how to [submit a DMCA Counter Notice](https://docs.github.com/en/articles/guide-to-submitting-a-dmca-counter-notice). + +To learn about when and why GitHub may process some notices this way, please visit our [README](https://github.com/github/dmca/blob/master/README.md#anatomy-of-a-takedown-notice). + +--- + +**Are you the copyright holder or authorized to act on the copyright owner's behalf? If you are submitting this notice on behalf of a company, please be sure to use an email address on the company's domain. If you use a personal email address for a notice submitted on behalf of a company, we may not be able to process it.** + +Yes, I am authorized to act on the copyright owner's behalf. + +**Are you submitting a revised DMCA notice after GitHub Trust & Safety requested you make changes to your original notice?** + +No + +**Does your claim involve content on GitHub or npm.js?** + +GitHub + +**Please describe the nature of your copyright ownership or authorization to act on the owner's behalf.** + +I am employed as [private] for Analog Devices, Inc. + +**Please provide a detailed description of the original copyrighted work that has allegedly been infringed.** + +LTspice® is a powerful, proprietary, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits. Its graphical schematic capture interface allows you to probe schematics and produce simulation results, which can be explored further through the built-in waveform viewer. LTspice’s enhancements and models improve the simulation of analog circuits when compared to other SPICE solutions. Although LTspice is free to use, you must agree to the LTspice Software License Agreement before downloading and using. + +The entire repository is dedicated to decrypting encrypted SPICE files. While I can only speak on behalf of Analog Devices' LTspice program, they also reference [private], which is owned by [private]. In the "Specifications" folder in the GitHub repository, "Jtsylve" has an entire spec for LTspice and says "This document describes the two encryption schemes used by LTspice to protect proprietary model and symbol files (.CIR, .SUB, .LIB, .ASY, and others)." This is a clear violation of our IP, and our License Agreement, which the user must accept to before using LTspice. Section 4, Restrictions, of our License Agreement states that "Licensee shall not modify, reverse engineer, decompile, disassemble or create derivative works of the Licensed Software." + +**If the original work referenced above is available online, please provide a URL.** + +https://www.analog.com/en/resources/design-tools-and-calculators/ltspice-simulator.html + +**We ask that a DMCA takedown notice list every specific file in the repository that is infringing, unless the entire contents of the repository are infringing on your copyright. Please clearly state that the entire repository is infringing, OR provide the specific files within the repository you would like removed.** + +**Based on the above, I confirm that:** + +The entire repository is infringing + +**Identify the full repository URL that is infringing:** + +https://github.com/jtsylve/spice-crypt + +**Do you claim to have any technological measures in place to control access to your copyrighted content? Please see our Complaints about Anti-Circumvention Technology if you are unsure.** + +Yes + +**What technological measures do you have in place and how do they effectively control access to your copyrighted material?** + +LTspice implements encryption and obfuscation of proprietary device model files. These measures are intended to allow end users to simulate devices as provided, while preventing access to internal implementation details, proprietary algorithms, and confidential parameterization used in the models. + +Access to LTspice and its encrypted model files is governed by the LTspice license agreement, which must be accepted at installation. The encryption serves as a technological protection measure that restricts users from viewing, extracting, or modifying the protected contents of the model files, thereby safeguarding copyrighted and proprietary information beyond the functional use of the software. + +**How is the accused project designed to circumvent your technological protection measures?** + +The accused project explicitly provides tools and methods to decrypt LTspice proprietary model files, thereby bypassing the encryption and obfuscation mechanisms intentionally put in place. This enables unauthorized access to protected internal model details that are not otherwise available through normal use of LTspice, effectively defeating the technological measures designed to protect our copyrighted software and confidential IP. + +**If you are reporting an allegedly infringing fork, please note that each fork is a distinct repository and must be identified separately. Please read more about forks. As forks may often contain different material than in the parent repository, if you believe any of the repositories or files in the forks are infringing, please list each fork URL below:** + +**Is the work licensed under an open source license?** + +No + +**What would be the best solution for the alleged infringement?** + +Reported content must be removed + +**Do you have the alleged infringer’s contact information? If so, please provide it.** + +Email: [private] +[private] : [private] + +**I have a good faith belief that use of the copyrighted materials described above on the infringing web pages is not authorized by the copyright owner, or its agent, or the law.** + +**I have taken fair use into consideration.** + +**I swear, under penalty of perjury, that the information in this notification is accurate and that I am the copyright owner, or am authorized to act on behalf of the owner, of an exclusive right that is allegedly infringed.** + +**I have read and understand GitHub's Guide to Submitting a DMCA Takedown Notice.** + +**So that we can get back to you, please provide either your telephone number or physical address.** + +[private] + +**Please type your full name for your signature.** + +[private]