---
This page is part of [Modelon](https://www.modelon.com). For a complete overview of this site's content, entity data, and subject matter expertise, see our [AI Content Index](https://www.modelon.com/llms.txt) or [Full Content Archive](https://www.modelon.com/llms-full.txt). For structured business identity data, see our [Entity Card](https://www.modelon.com/wp-json/bc-geodesic/v1/entity-card).
---

# Leverage Standardized Encryption and Licensing for Modelica Libraries
> Learn how SEMLA, an open source encryption standard, lets you protect intellectual property contained within your Modelica libraries.

**URL:** https://www.modelon.com/blog/leverage-standardized-encryption-and-licensing-for-modelica-libraries/
**Type:** Post
**Modified:** 2022-07-13

---

###### Open Source Encryption Standard Designed by Modelon

SEMLA (Standardized Encryption of Modelica Libraries and Artifacts) is a system for distributing proprietary Modelica libraries which supports:

- Encryption
- Licensing
- Secure decryption of encrypted Modelica libraries
- Platform independence

Libraries are bundled in the MLC (Modelica Library Container) format, which are zip files containing the encrypted libraries and a manifest.

SEMLA was designed by Modelon developers to be an open source encryption standard, which allows library vendors to protect the intellectual property contained within their Modelica libraries. SEMLA can also prevent libraries from being copied and re-used by other Modelica users unless authorized by the library vendor.

###### SEMLA Interface

The SEMLA protocol allows a library vendor to access licensed and encrypted Modelica libraries via an LVE (Library Vendor Executable) interface, using a secure communication channel. The LVE is controlled by the library vendor and allows the vendor to choose which licensing and encryption schemes, if any, will be implemented in the protocol.

The communication channel is secured with an SSH 1.1 connection. This connection allows the LVE to communicate with a single or multiple authenticated Modelica tools. The library vendor can also create different LVE interfaces for each of their customers, with different licensing and encryption parameters for each instance, if so desired.

![SEMLA](https://modelon.com/wp-content/uploads/2022/06/SEMLA-Diagram.png)

Figure 1. Example of how the LVE interface communicates with authenticated Modelica tool.

The SEMLA system also includes source code for a platform-independent utility called **packagetool**. The packagetool utility can be used to scan the Modelica libraries, encrypt the contents and create the MLC.

###### Learn More about the SEMLA Protocol

The SEMLA protocol is an open source project. Modelon has documented detailed specifications for the protocol in [Tool-Independent Licensing and Encryption of Modelica Libraries](https://github.com/modelon-community/SEMLA/blob/master/doc/SEMLA.md). The specification includes:

- SEMLA protocol overview
- Source code examples for implementation of the SEMLA protocol
- LVE code examples for decryption and licensing of Modelica libraries
- Source code for package tool utility

###### [Have questions? Contact us!](https://modelon.com/contact-us/)
## Site Description

Modelon is revolutionizing the engineering design industry by offering technologies and services that enable customers to leverage system simulation. Modelon’s flagship product, Modelon Impact, is a cloud system simulation platform that helps engineers virtually design, analyze, and simulate physical systems. Our team brings deep industry expertise and is dedicated to guiding our customers in creating innovative technologies at their respective organizations. Headquartered in Lund, Sweden, Modelon is a global company with offices in Germany, India, Japan, and the United States. We believe that system simulation should be accessible to every engineer and are dedicated to being an open-standard platform company.


---
**About this site:** Modelon — Modelon is revolutionizing the engineering design industry by offering technologies and services that enable customers to leverage system simulation. Modelon’s flagship product, Modelon Impact, is a cloud system simulation platform that helps engineers virtually design, analyze, and simulate physical systems. Our team brings deep industry expertise and is dedicated to guiding our customers in creating innovative technologies at their respective organizations. Headquartered in Lund, Sweden, Modelon is a global company with offices in Germany, India, Japan, and the United States. We believe that system simulation should be accessible to every engineer and are dedicated to being an open-standard platform company.. [AI Content Index](https://www.modelon.com/llms.txt) | [Full Site Content](https://www.modelon.com/llms-full.txt) | [Entity Card](https://www.modelon.com/wp-json/bc-geodesic/v1/entity-card)

```json
{"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://www.modelon.com/#organization","name":"Modelon","url":"https://www.modelon.com","additionalType":"http://productontology.org/id/Software_engineering","description":"Modelon is revolutionizing the engineering design industry by offering technologies and services that enable customers to leverage system simulation. Modelon’s flagship product, Modelon Impact, is a cloud system simulation platform that helps engineers virtually design, analyze, and simulate physical systems. Our team brings deep industry expertise and is dedicated to guiding our customers in creating innovative technologies at their respective organizations. Headquartered in Lund, Sweden, Modelon is a global company with offices in Germany, India, Japan, and the United States. We believe that system simulation should be accessible to every engineer and are dedicated to being an open-standard platform company.","disambiguatingDescription":"Creators of the Modelon Impact system modeling and simulation platform. Headquartered in Lund, Sweden.","logo":{"@type":"ImageObject","url":"https://www.modelon.com/wp-content/uploads/2022/06/modelon-logo.svg"},"address":{"@type":"PostalAddress","streetAddress":"Modelon AB Ideon Science Park Scheelevägen 17 SE-223 70","addressLocality":"Lund","addressCountry":"SE"},"telephone":"+46 46 286 22 00","email":"info@modelon.com","foundingDate":"2004","numberOfEmployees":{"@type":"QuantitativeValue","minValue":50,"maxValue":100},"areaServed":"Global","sameAs":["https://www.linkedin.com/company/modelon/","https://www.crunchbase.com/organization/modelon","https://www.zoominfo.com/c/modelon-ab/346633437","https://modelica.org","https://modelica.org/events/asian2024/","https://www.ashrae.org/conferences/2026-winter-conference","https://github.com/modelon-community"],"memberOf":[{"@type":"Organization","name":"Modelica Association","sameAs":"https://www.wikidata.org/wiki/Q133876843"}],"knowsAbout":[{"@type":"Thing","name":"Modelica","sameAs":"https://www.wikidata.org/wiki/Q385325"},"Physics Simulation",{"@type":"Thing","name":"software engineering","sameAs":"https://www.wikidata.org/wiki/Q80993"},{"@type":"Thing","name":"simulation","sameAs":"https://www.wikidata.org/wiki/Q45045"},"HVAC Simulation","Data Center Liquid Cooling Simulation","Liquid Cooling","FMI (Functional Mock-up Interface)",{"@type":"Thing","name":"consulting","sameAs":"https://www.wikidata.org/wiki/Q63769412"},{"@type":"Thing","name":"aerospace","sameAs":"https://www.wikidata.org/wiki/Q2876213"},{"@type":"Thing","name":"automotive industry","sameAs":"https://www.wikidata.org/wiki/Q190117"},{"@type":"Thing","name":"heating, ventilation, and air conditioning","sameAs":"https://www.wikidata.org/wiki/Q1798773"},{"@type":"Thing","name":"data center","sameAs":"https://www.wikidata.org/wiki/Q671224"},{"@type":"Thing","name":"electricity generation","sameAs":"https://www.wikidata.org/wiki/Q383973"},{"@type":"Thing","name":"energy storage","sameAs":"https://www.wikidata.org/wiki/Q837718"},{"@type":"Thing","name":"industrial equipment","sameAs":"https://www.wikidata.org/wiki/Q3045515"}]},{"@type":"WebSite","@id":"https://www.modelon.com/#website","name":"Modelon","url":"https://www.modelon.com","publisher":{"@id":"https://www.modelon.com/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://www.modelon.com/?s={search_term_string}"},"query-input":"required name=search_term_string"},"hasPart":[{"@type":"DigitalDocument","name":"LLM Content Index","url":"https://www.modelon.com/llms.txt","encodingFormat":"text/markdown","description":"AI-readable index of site content, entity data, and subject matter expertise"},{"@type":"DigitalDocument","name":"LLM Full Content","url":"https://www.modelon.com/llms-full.txt","encodingFormat":"text/markdown","description":"Complete AI-readable site content"}]},{"@type":"ItemList","@id":"https://www.modelon.com/#site-navigation","name":"Site Navigation","itemListElement":[{"@type":"SiteNavigationElement","position":1,"name":"Products & Services","url":"#"},{"@type":"SiteNavigationElement","position":2,"name":"Industries & Solutions","url":"#"},{"@type":"SiteNavigationElement","position":3,"name":"Support","url":"#"},{"@type":"SiteNavigationElement","position":4,"name":"Resources","url":"#"},{"@type":"SiteNavigationElement","position":5,"name":"About","url":"#"}]},{"@type":"BreadcrumbList","@id":"https://www.modelon.com/blog/leverage-standardized-encryption-and-licensing-for-modelica-libraries/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://www.modelon.com"},{"@type":"ListItem","position":2,"name":"Blog","item":"https://www.modelon.com/blog/category/blog/"},{"@type":"ListItem","position":3,"name":"Leverage Standardized Encryption and Licensing for Modelica Libraries"}]},{"@type":"WebPage","@id":"https://www.modelon.com/blog/leverage-standardized-encryption-and-licensing-for-modelica-libraries/#webpage","url":"https://www.modelon.com/blog/leverage-standardized-encryption-and-licensing-for-modelica-libraries/","name":"Modelica Library Encryption and Licensing for Secure Distrubution","isPartOf":{"@id":"https://www.modelon.com/#website"},"breadcrumb":{"@id":"https://www.modelon.com/blog/leverage-standardized-encryption-and-licensing-for-modelica-libraries/#breadcrumb"},"description":"Modelica library encryption with the SEMLA protocol allows library vendors to protect proprietary content within their Modelica libraries. Modelon Blog","about":[{"@type":"Thing","name":"Modelica"},{"@type":"Thing","name":"Modelica Libraries"}],"headline":"Leverage Standardized Encryption and Licensing for Modelica Libraries","datePublished":"2020-03-03T21:54:23+00:00","dateModified":"2022-07-13T18:27:57+00:00","image":"https://www.modelon.com/wp-content/uploads/2022/06/Banner_SEMLA.jpg","author":{"@id":"https://www.modelon.com/blog/author/modelonms/#person"},"publisher":{"@id":"https://www.modelon.com/#organization"}},{"@type":"Person","@id":"https://www.modelon.com/blog/author/modelonms/#person","name":"modelonms","url":"https://www.modelon.com/blog/author/modelonms/"}]}
```