Toggle Nav
My Cart
Search
Advanced Search
Menu
Account

Libfredo6 Old Version Upd Upd

To update an old version of , a shared library required for popular SketchUp plugins like RoundCorner JointPushPull , follow these steps. Recommended Update Method (Automatic)

The easiest way to keep LibFredo6 and all related plugins up to date is through the Sketchucation ExtensionStore tool Open ExtensionStore : In SketchUp, open the Sketchucation toolset. Check for Updates

: Click the gear icon at the top left to see a list of extensions needing updates. Update All

: Click "Update All" or the individual "Update" button next to LibFredo6. Restart SketchUp quit and restart SketchUp for the update to load properly. Manual Update Method (RBZ File)

If you prefer manual installation or are using an older SketchUp version: Download the RBZ : Get the latest version from the LibFredo6 page on Sketchucation . A free account is required. Install via Extension Manager In SketchUp, go to Window > Extension Manager Install Extension and select the downloaded Restart SketchUp : This step is critical to avoid loading errors. Legacy Support (For Older SketchUp Versions) If you are using a version of SketchUp older than 2017 , you must use "frozen" legacy versions of the library. SketchUp 2016 and older Archived LibFredo6 v9.5k SketchUp 2017 to Present : Modern versions of LibFredo6 (v10.0+) are compatible. Troubleshooting Tips LibFredo6 Installation in Sketchup 2025 - Extensions 9 Aug 2025 —

Before you begin:

  1. Close SketchUp completely.
  2. Back up your plugins folder. (Located in C:\Users\[YourName]\AppData\Roaming\SketchUp\SketchUp 2017\SketchUp\Plugins on Windows, or ~/Library/Application Support/SketchUp 2017/SketchUp/Plugins on Mac).

Where to Find Old Versions

The official and safest repository for Fredo6’s plugins is the SketchUcation Plugin Store. Fredo6 maintains a detailed version history there.

Feature: The "Fredo6 Tools" Preference Manager

While LibFredo6 is a runtime library (meaning it has no visible modeling tools of its own), its primary "feature" is providing a centralized control panel for all other Fredo6 extensions (like RoundCorner, JointPushPull, etc.).

How it works:

  1. Centralized Settings: Instead of hunting through different menus for every individual plugin, LibFredo6 adds a "Fredo6 Tools" menu item to your SketchUp toolbar (often found under the Tools menu or as a toolbar button).
  2. Uniformity: It enforces a consistent User Interface (UI) across all installed Fredo6 plugins. This means the icons, dialog boxes, and shortcut keys behave the same way in RoundCorner as they do in Curviloft.
  3. Language & Updates: It allows users to set a default language for all Fredo6 plugins at once and historically managed the "Check for Updates" function before the Extension Warehouse became the standard.

Why this matters for "Old Version" users: If you are looking at an old version log, the "UPD" likely refers to the implementation of the automatic update notifier, which was a revolutionary feature at the time. It allowed the library to check the web for new versions of all Fredo6 scripts simultaneously, saving the user from manually checking websites.

Note on the search term: "LibFredo6" is not a standalone tool; it is a dependency. If you are trying to update an old version, you must install the latest LibFredo6 .rbz file to make older scripts like JointPushPull function correctly on newer SketchUp versions.

Report: libfredo6 Old Version Update

Introduction

libfredo6 is a library used in various applications, and it's essential to keep it up-to-date to ensure compatibility, security, and performance. This report aims to provide an overview of the outdated libfredo6 version and recommend necessary actions for updating it.

Current Status

Key Findings

  1. Version Comparison: The current version of libfredo6 (vX.X.X) is older than the latest version (vY.Y.Y).
  2. Security Vulnerabilities: The outdated version may contain known security vulnerabilities that can be exploited by attackers, compromising the application's security.
  3. Compatibility Issues: The old version may not be compatible with newer dependencies, libraries, or frameworks, leading to potential errors or crashes.
  4. Performance Impact: Outdated libraries can result in performance degradation or inefficiencies, affecting the overall user experience.

Recommendations

  1. Update libfredo6: Upgrade libfredo6 to the latest version (vY.Y.Y) to ensure you have the latest security patches, features, and performance enhancements.
  2. Dependency Review: Review and update other dependencies, libraries, or frameworks that may be affected by the libfredo6 update.
  3. Testing and Verification: Perform thorough testing and verification to ensure the updated libfredo6 version does not introduce any regressions or compatibility issues.

Action Plan

  1. Update libfredo6: [Insert responsible person's name] will update libfredo6 to the latest version (vY.Y.Y) by [Insert Date].
  2. Dependency Review: [Insert responsible person's name] will review and update other dependencies, libraries, or frameworks as needed.
  3. Testing and Verification: [Insert responsible person's name] will perform thorough testing and verification to ensure the updated libfredo6 version.

Conclusion

Updating libfredo6 to the latest version is essential to ensure the application's security, compatibility, and performance. By following the recommended actions and action plan, we can ensure a smooth update process and minimize potential risks.

Appendices

Keeping Your SketchUp Smooth: The Guide to LibFredo6 Updates

If you use SketchUp, you’ve likely encountered LibFredo6. It isn't a standalone tool; rather, it’s a vital shared library that powers some of the most popular extensions like RoundCorner, Curviloft, and JointPushPull.

When users search for "libfredo6 old version upd," they are usually hitting a wall where their favorite plugins stop working because the underlying library is out of sync with their SketchUp version. Here is everything you need to know about managing LibFredo6 versions. Why You Need to Update

LibFredo6 handles the "heavy lifting" for other plugins—things like language translation, default parameters, and update checking. If LibFredo6 is outdated, your other Fredo6 plugins may: Fail to load entirely. Display error messages about missing dependencies.

Lack compatibility with newer SketchUp releases (like SU2024 or SU2026). Dealing with "Legacy" Versions

If you are running an older version of SketchUp, you cannot always use the latest LibFredo6.

SketchUp 2017 to 2026+: You should use the latest versions (v10.0 and above). The current release as of early 2026 is v15.9a.

SketchUp 2016 and Older: These require "Legacy" versions. The final archived version for pre-2017 SketchUp is v9.5k. Note that "Check for Updates" is often disabled in these older legacy versions. How to Update Properly

There are two main ways to ensure you have the correct version installed: Update for Fredo6 Plugins - Extensions - SketchUp Community

is a shared plugin library required to run most extensions developed by

(such as RoundCorner, JointPushPull, and Curviloft). If you are using an older version of SketchUp (pre-2017) or encountering compatibility errors, you may need a specific legacy version or a technical update to your library. Core Functions

LibFredo6 is not a standalone tool; rather, it provides a unified framework for: Language Translation : Localizing Fredo6 tools into multiple languages. Menu Management

: Standardizing how toolbars and settings appear in SketchUp. Check for Updates

: A built-in feature to notify users when a new version of the library or a dependent plugin is available. Technical Compliance

: Managing file and folder naming conventions to remain compatible with the SketchUp Extension Warehouse. Legacy Versions for Older SketchUp

Newer versions of LibFredo6 (v10.0 and above) generally require SketchUp 2017

or newer. If you are running an older version of SketchUp, you must use a legacy release: SketchUcation LibFredo6 v9.5k : This is the primary archived version for users on SketchUp 8, 2013, 2014, 2015, and 2016 Availability : These legacy versions are hosted on the SketchUcation PluginStore specifically for users with "old" software setups. SketchUcation Unable to update or remove extensions (Fredo). SU Pro 2020

LibFredo6 is an essential shared library for SketchUp, required to run almost all extensions created by the developer Fredo6 (such as RoundCorner, Curviloft, and JointPushPull). It is not a standalone tool but rather provides the underlying framework for language translation, default parameters, and update checks across his plugin suite. Version & Performance Insights libfredo6 old version upd

Essential Support: Most modern Fredo6 plugins will not function—or may not even appear in SketchUp—if LibFredo6 is missing or outdated. Compatibility: Current Versions: Released for SketchUp 2017 and newer.

Legacy Versions: For users on older versions (SketchUp 2016 and prior), a specific legacy version (v9.5k) is maintained as a separate download.

High-Resolution Support: Since v7.7a, it includes better scaling for high-DPI (double dpi) screens to prevent tiny toolbars. Critical Maintenance Tips

Fredo6 plugins - LEGACY versions prior SU2017 | sketchucation

Subject: Updating an Old Version of LibFredo6

Response:

If you are using an older version of LibFredo6, here is the recommended approach to update it safely:

  1. Do NOT update manually by replacing files unless you are sure. LibFredo6 is a shared library used by many of Fredo6’s tools (RoundCorner, FredoScale, TopoShaper, etc.). Mixing old and new versions can cause conflicts.

  2. Recommended Method – Use Fredo6’s own tool:

    • In SketchUp, go to Extensions → LibFredo6 → Check for Updates.
    • If your version is very old, this menu option may not exist. In that case, proceed to step 3.

  3. Clean Manual Update (for very old versions):

    • First, uninstall the old LibFredo6 completely via Window → Extension Manager (SketchUp 2017+).
    • Second, restart SketchUp.
    • Third, download the latest LibFredo6 from Fredo6’s official page:
      https://fredo6.github.io/
    • Fourth, install the new .rbz file via Extensions → Install Extension.

  4. Important Notes:

    • LibFredo6 is free and requires no license.
    • After updating, you may need to update your other Fredo6 tools (RoundCorner, etc.) to their latest versions for full compatibility.
    • If you see error messages after updating, go to LibFredo6 → Reset Preferences.

  5. If you are using SketchUp 2013 or older:

    • The latest LibFredo6 no longer supports very old SketchUp versions. You may need to stay on an older LibFredo6 version or upgrade SketchUp.

Let me know if you run into any specific error messages or need help identifying your current version.

Understanding LibFredo6: Updates and Legacy Versions for SketchUp

If you use SketchUp, you’ve likely encountered popular extensions like Curviloft, RoundCorner, or FredoScale. These powerful tools rely on a foundational shared library called LibFredo6. While the latest versions are designed for modern SketchUp releases, many users still search for "libfredo6 old version upd" because they are running older software or encountering compatibility issues. What is LibFredo6?

Developed by Fredo6, this library is not a standalone plugin. Instead, it provides common functions—such as user interface elements, language translations, and update checkers—that allow Fredo6's other extensions to function.

Host Site: Most official files are hosted on the SketchUcation PluginStore, which requires a free account for downloads.

Core Function: It manages default parameters, trace logging, and ensures your other Fredo6 plugins can communicate with the SketchUp API. Legacy Versions for Older SketchUp Builds

The primary reason to seek an "old version" is software compatibility. As of version 10.0, LibFredo6 is maintained only for SketchUp 2017 and above.

For users on older systems, Fredo6 provides Legacy (Prior_2017) versions:

Compatibility: These are designed specifically for SketchUp versions prior to 2017 (e.g., SU8, SU2013–2016).

Archived Version: The latest archived legacy version is typically v9.5k.

Key Difference: Legacy versions have the "Check Plugins for Update" functionality disabled to prevent compatibility errors with modern library changes.

Where to find: These can be found on the SketchUcation Legacy Archive. How to Update LibFredo6 (Manually or Automatically)

Keeping LibFredo6 updated is critical because most Fredo6 plugins will stop working if the library version is too far behind the plugin version. Update for Fredo6 Plugins - Extensions - SketchUp Community

Understanding the Keyword: "libfredo6 old version upd"

Let’s break down what users are actually looking for when they type libfredo6 old version upd:

The search stems from a common pain point: automatic updates or manual installation of the newest LibFredo6 (v8.x or higher) often requires SketchUp 2021+ or specific Ruby API changes. If you try to load a modern LibFredo6 in an older host, you will receive syntax errors, missing class errors, or a complete failure to load.

Conclusion: Honoring the Legacy

Fredo6 is a genius developer, but his focus is (rightfully) on the future of SketchUp. The "libfredo6 old version upd" search is a testament to the longevity of his code. Users are still trying to run RoundCorner on SketchUp 2015 because that specific workflow hasn't been beaten by modern tools.

If you need an old version, remember the golden rules:

  1. Back up first.
  2. Delete the old folder manually.
  3. Kill the auto-updater in preferences.

Whether you are preserving a historic rendering project or maintaining a legacy pipeline for a factory, the old versions of LibFredo6 are still out there—you just have to know how to tame the "Upd" beast.

Have a specific error code? Visit the Official Fredo6 SketchUcation forum thread. Do not ask for pirated versions; the community is strict about supporting the developer's free work.

If you are using an older version of SketchUp (specifically versions prior to SU2017), you cannot use the current updates. Instead, you must use a dedicated legacy/archived version

to keep your plugins like Curviloft or RoundCorner functional. SketchUp Community Essential Legacy Version Details For users on SketchUp 8 through SU2016 , the most stable and recommended legacy version is LibFredo6 v9.5k SketchUcation Compatibility : This version is strictly for SU2016 and older

. It will not work properly on modern versions (SU2017+), which require or higher. Key Limitation "Check for Update"

feature is disabled in legacy versions to prevent them from accidentally trying to install incompatible modern versions. Where to Download : You can find this archived version on the SketchUcation PluginStore under the name "Prior2017 - LibFredo6" SketchUp Community How to Install an Old Version (.rbz)

Since older SketchUp versions have different menu layouts, follow these steps based on your software version: SketchUp 2013 to 2016 Window > Preferences > Extensions Install Extension button at the bottom. Select your downloaded LibFredo6_9.5k.rbz SketchUp 8

If you don't see an "Install Extension" button in Preferences, you may need to update to the latest maintenance release of SU8. To update an old version of , a

Alternatively, you can manually extract the contents into your Plugins folder (usually located in

C:\Users\YourName\AppData\Roaming\SketchUp\SketchUp 8\SketchUp\Plugins Final Step Restart SketchUp immediately after installation to initialize the library. SketchUcation Troubleshooting Common Issues

The Evolution and Legacy of LibFredo6: Bridging Versions in SketchUp

The LibFredo6 plugin library, developed by the prolific developer Fredo6, is a cornerstone of the SketchUp extension ecosystem. While recent updates focus on modern compatibility, the "old" or legacy versions of LibFredo6 remain vital for users maintaining older software environments. The Role of LibFredo6

LibFredo6 is not a standalone tool but a shared library that powers iconic extensions like RoundCorner, FredoScale, and Curviloft. It provides a unified framework for:

Language Translation: Enabling global use across multiple languages.

Global Settings: Managing default parameters across various Fredo6 tools.

Update Checking: Notifying users of new features or critical bug fixes. The Legacy Divide: Pre-2017 vs. Modern

A major shift occurred with version 10.0, which dropped support for versions prior to SketchUp 2017. This created two distinct update paths:

Modern Path (SU2017+): Users are encouraged to use the latest version available on the SketchUcation PluginStore or the SketchUp Extension Warehouse.

Legacy Path (Prior to SU2017): For older setups (e.g., SU2016), users must specifically seek out Archived Version v9.5k. Using modern versions on old SketchUp installs—or vice-versa—often results in signature errors or tool failures. Importance of Proper Installation

Updating LibFredo6 is often the primary solution for "outdated signature" messages or plugins that appear but don't function. Experts on the SketchUp Community Forums recommend using the SketchUcation ExtensionStore tool to automate these updates and ensure library dependencies are correctly met.

In conclusion, LibFredo6 exemplifies the challenges of long-term software maintenance. By providing dedicated legacy versions, Fredo6 ensures that even users on decade-old hardware can still leverage powerful 3D modeling tools, provided they navigate the versioning requirements correctly. AI responses may include mistakes. Learn more Update for Fredo6 Plugins - Extensions - SketchUp Community

Here’s a helpful, practical story about updating an old version of LibFredo6 (a popular plugin library for SketchUp) — framed as a lesson in keeping tools current.

To download older versions:

  1. Visit SketchUcation Plugin Store
  2. Search "LibFredo6"
  3. Look for "Version History" or "Previous Versions"
  4. Download the specific RBZ file you need

Alternative: If you can't find what you need, describe:

I can then provide more targeted guidance.

The core of many SketchUp workflows, LibFredo6, is a critical shared library for extensions like FredoCorner and JointPushPull. While newer versions (v10.0+) focus on SketchUp 2017 and above, many users still rely on legacy/old versions to maintain compatibility with older software or specific hardware. The Role of LibFredo6

LibFredo6 is not a standalone tool; instead, it acts as the "key" that unlocks other Fredo6 extensions. It provides foundational features such as:

Language Translation: Enabling multi-language support (English, French, Spanish, Chinese, etc.) across various plugins.

Maintenance Utilities: Tools for purging obsolete files and managing default parameters.

Performance Monitoring: A synthetic view of plugin load times to help users optimize their SketchUp startup. Legacy Versions and Compatibility

As software evolves, older versions of LibFredo6 remain vital for users on aging platforms:

The Evolution of Libfredo6: Understanding the Old Version Update

Libfredo6, a popular library used in various applications, has undergone significant changes over the years. One aspect that has garnered attention is the "old version upd" or update process. In this article, we'll delve into the world of Libfredo6, exploring its history, the importance of updates, and what the "old version upd" entails.

What is Libfredo6?

Libfredo6 is a software library designed to provide a set of functionalities for various applications. Its primary purpose is to offer a common framework for developers to build upon, making it easier to create compatible software. Libfredo6 has become a crucial component in many projects, and its updates are eagerly anticipated by the developer community.

The Importance of Updates

Software libraries like Libfredo6 require regular updates to ensure they remain compatible with evolving technologies, address security vulnerabilities, and provide new features. Updates are essential for maintaining the stability, performance, and security of applications that rely on Libfredo6.

The "Old Version Upd" Process

The "old version upd" refers to the process of updating older versions of Libfredo6 to newer ones. This process involves modifying the existing library to incorporate changes, bug fixes, and new features. The goal is to ensure seamless compatibility between the updated library and applications that depend on it.

Challenges in Updating Libfredo6

Updating Libfredo6 can be a complex task, especially when dealing with older versions. Some of the challenges include:

  1. Backward compatibility: Ensuring that the updated library remains compatible with older applications that rely on it.
  2. Deprecation of features: Removing outdated features and functions while maintaining support for existing applications.
  3. Security patches: Integrating security patches and fixes into the updated library.

Best Practices for Libfredo6 Updates

To ensure a smooth update process, developers follow best practices, including:

  1. Version control: Maintaining a clear version control system to track changes and updates.
  2. Testing: Thoroughly testing the updated library to ensure compatibility and stability.
  3. Documentation: Providing detailed documentation on changes, new features, and deprecations.

Conclusion

The "old version upd" process for Libfredo6 is a critical aspect of maintaining the library's relevance and compatibility. By understanding the importance of updates, challenges, and best practices, developers can ensure a seamless transition to newer versions of Libfredo6. As the library continues to evolve, it's essential to stay informed about the latest developments and updates to ensure the stability and security of applications that rely on it.

Additional Resources

By following these resources, developers can stay up-to-date on the latest Libfredo6 updates, best practices, and community discussions.

Keeping Your SketchUp Legacy Alive: A Guide to LibFredo6 Old Version Updates

If you are a SketchUp veteran, you know that LibFredo6 is the backbone of the most powerful extensions like RoundCorner, JointPushPull, and Curviloft. However, a major shift in the Trimble framework changed how these plugins work for older versions of SketchUp.

Whether you are intentionally staying on a legacy version of SketchUp or just trying to fix a "broken" plugin, here is everything you need to know about updating and managing LibFredo6. The Great Divide: SU2017 and Above vs. Older Versions

Since the release of v10.0, newer versions of LibFredo6 are strictly compatible with SketchUp 2017 and later. If you are running an older version of the software, simply "updating" to the latest file on the SketchUcation PluginStore will likely break your workflow.

For SU2017+ Users: You can always find the most current version (like v15.9a) on the main LibFredo6 PluginStore page.

For Legacy Users (Pre-SU2017): You must use the archived legacy versions. These are prefixed with the "Prior_2017" keyword. Where to Find Old Version Updates

If you are running SketchUp 2016 or earlier, do not download the standard RBZ file. Instead, look for:

Prior2017 - LibFredo6 (v9.5k): This is the final stable version for SketchUp 8, 2013, 2014, 2015, and 2016.

The SketchUcation Legacy Archive: This dedicated forum post contains links to all compatible legacy versions of Fredo6's plugins. Pro Tips for a Smooth Installation

Restart is Mandatory: Every time you install or update the library, you must quit and restart SketchUp to sync the library with its dependent extensions.

Use the SketchUcation ExtensionStore Tool: This is the easiest way to manage updates. It will notify you when a new version is available and handle the installation directly within SketchUp.

Manual Installation (For Pre-2017): If the Extension Manager isn't cooperating, you can manually extract the LibFredo6 ZIP content into your Plugins folder.

Check for "Check for Update": In older legacy versions, Fredo6 has actually disabled the "Check for Update" feature to prevent users from accidentally installing a version that is too new for their SketchUp build. Troubleshooting Common Issues

Plugin Not Showing? Ensure that LibFredo6 and the specific extension (e.g., RoundCorner) are installed in the same folder.

Permission Errors? On Windows, it is often helpful to run your SketchUp installer as an Administrator and select "Repair" to fix permissions that might be blocking the plugin from loading.

By sticking to the archived legacy versions for older software, you can ensure your favorite design tools keep running smoothly without the headache of "version mismatch" errors.

Are you having trouble with a specific Fredo6 extension not loading after an update?

Prior2017 - LibFredo6 - Archived version v9.5k - SketchUcation

If you are looking to update an old version of LibFredo6 (especially for legacy SketchUp versions like SU2016 and earlier), here is how to handle the "feature" or process of updating: 1. Identify Your SketchUp Version

The update path for LibFredo6 changed significantly after 2017: SketchUp 2017 and Newer : You should use the current regular version of LibFredo6, which is actively maintained on the SketchUcation PluginStore SketchUp 2016 and Older : You must use specific Legacy/Archived versions

. The standard "Check for Update" feature is disabled in these legacy versions. SketchUp Community 2. Accessing Legacy Versions (Prior SU2017)

For older SketchUp installs, you cannot use the auto-update feature. You must manually download the "Prior_2017" files: LibFredo6 v9.5k

: This is the final archived version compatible with SU8 through SU2016. : These are hosted on the SketchUcation ExtensionStore under the "Prior_2017" keyword. SketchUp Community 3. How to Perform the Update

Because many LibFredo6 features rely on server-side information that may no longer support old versions, follow these steps for a clean update: Manual Download : Download the file for the legacy version from the SketchUcation website Clean Install

: It is often recommended to delete old LibFredo6 files from your

folder before installing the new legacy version to avoid "outdated signature" errors or conflicts. Install via SketchUp Window > Extension Manager Preferences > Extensions in very old versions) and click Install Extension to select your downloaded SketchUp Community 4. Updating Dependent Plugins

If you update LibFredo6, you almost always need to update the plugins that use it (e.g., RoundCorner JointPushPull FredoScale

) to their corresponding legacy versions at the same time to ensure compatibility. SketchUp Community direct download links

for specific legacy plugins to match your LibFredo6 version?

Libfredo6 Fredo_scale (outdated signature) - SketchUp Forums 20 Feb 2019 —

What is libfredo6? libfredo6 is a dependency library used by some applications, including SketchUp. It's essential to keep it up-to-date to ensure compatibility and stability.

Before you start:

  1. Check your current version: Look for the libfredo6 version currently installed on your system. You can do this by:
    • Windows: Go to C:\Program Files\SketchUp\SketchUp 20XX\Plugins (replace 20XX with your SketchUp version) and look for libfredo6.dll. Right-click on it and select "Properties" to see the version.
    • macOS (via Terminal): Run ls /Applications/SketchUp\ SketchUp\*/Contents/Frameworks/libfredo6.framework/Versions/Current/
  2. Backup your system: Before updating, create a system restore point or backup your important files to prevent any potential issues.

Updating libfredo6:

Method 1: Update via SketchUp Extension Manager (Recommended)

  1. Open SketchUp and go to Window > Extension Manager.
  2. Search for "libfredo6" in the search bar.
  3. If an update is available, click the "Update" button next to libfredo6.
  4. Follow the prompts to complete the update.

Method 2: Manual Update

  1. Download the latest libfredo6 version: Visit the libfredo6 download page and download the latest version compatible with your SketchUp version.
  2. Extract the archive: Unzip the downloaded archive to a temporary folder.
  3. Replace the old library:
    • Windows: Go to C:\Program Files\SketchUp\SketchUp 20XX\Plugins (replace 20XX with your SketchUp version) and replace the existing libfredo6.dll file with the new one.
    • macOS: Go to /Applications/SketchUp\ SketchUp\*/Contents/Frameworks/ and replace the existing libfredo6.framework with the new one.

Verify the update:

  1. Restart SketchUp or the application using libfredo6.
  2. Check the libfredo6 version again to ensure it's updated.

Release highlights

The Risks of Using "libfredo6 old version upd"

While necessary in some cases, using legacy updates comes with inherent risks:

Wildcard SSL Certificates