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Huygens Floating Licenses

A Flexible multi-user Huygens solution!

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Low cost multi-user solution

Multiple users can use Huygens on their own local machine

Simple and quick to set-up

The external license servers are fully maintained by SVI.

Extremely flexible

Use Huygens on any workstation, PC or laptop within your lab(s) and facility!



Why a Floating License?

Multi-user access for Huygens is already possible with the web-based Huygens Remote Manager, and Remote Display application sharing, yet these solutions are designed for running on a single powerful workstation/server. But what if you have multiple independent workstations, and what if you would like to make Huygens available on those multiple user systems in your lab or facility? To address the growing usage of the Huygens software, we have introduced a new floating license option that extends the flexibility of our Huygens multi-user solutions.

The floating license system is a great solution, as it allows you to use Huygens on multiple systems and for a fraction of the cost of multiple node-locked licenses.

The floating license is a special license string, which allows you to run Huygens on a number of computers in a facility, lab or department, allowing great flexibility for low multi-user costs. With a floating license it is possible to install and use Huygens on many desktops and workstations in the lab/facility simply by downloading the latest Huygens version and adding the Huygens floating license on each of these systems.

The number of allowed concurrent users starts from one (single floating license), and can be increased depending on the concurrent usage. A single floating license can already be used on multiple systems.
The floating license allows the users to run Huygens on their local machines, so as opposed to our other multi-user Huygens solutions, there is no centralized computation server and no remote login required. Since the user can run and use Huygens locally, the user can also decide when to update the software.

What are the advantages?

  • Huygens can be used on multiple systems at low cost, even with a single floating license
  • No need to maintain a license server. The license server is external and managed completely by SVI.
  • Easy to download and to install (regular Huygens Suite installer)
  • No third parties involved in the license mechanism.
  • Users can run Huygens on local machines: there is no need for remote login procedures.

How does it work?

The Huygens floating license system is based on IP address validation, so the PC's using the floating license must be connected to the internet. You can decide which specific IP addresses in your labs/facility are allowed to use the license. By broadening/shrinking authorized IP range, it is possible to increase/decrease the number of users that are allowed to use the license.

The number of concurrent users will determine how many floating licenses are required. For example: if there is typically 1 Huygens instance running concurrently, then a single floating license is sufficient. As an extra, a certain amount of overshoot is allowed: for a total of 3,000 minutes per year, it is allowed to use Huygens on more systems concurrently. In the example of a single floating license, it is also allowed to use Huygens on two or more systems concurrently up to a total of 3000 minutes per year.

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Huygens Floating License Features

  • The number of allowed concurrent users is determined by the number of floating licenses that are purchased.
  • Certain amount of overshoot is allowed: for a total of 3,000 minutes per year, it is allowed to use Huygens on more systems concurrently.
  • You decide the range of IP addresses in which the Huygens floating licenses can be used. You can adapt this range any time by sending an email to support at svi.nl with the changed or new range of IP addresses.
  • Each Huygens instance (client) with a floating license, will connect with our floating license servers on startup. The floating license servers will check if the IP address is allowed to use the floating license. If the client is authorized, the server validates the license and the user can use Huygens on his or her computer. This all happens in a few milliseconds, so the user hardly notices.
  • After closing Huygens, the license will continue to work for another 72 hours, even outside of the allowed IP range. This is ideal if you would like to use Huygens at home on your notebook in the evening, when you are traveling or visiting a conference.
  • You will receive periodic overviews so that you can monitor the actual (concurrent) usage and adapt the IP range if necessary.

The Huygens floating license is a great multi-user solution, whether you are a small lab or large microscopy facility, the amount of concurrent users and license configuration can be completely tailored to your specific needs.

Would you like to know more?

If would like to learn more about how the Huygens floating license could be useful in your lab or facility, then you are always welcome to contact us at sales at svi.nl for further details. If you already have a node-locked Huygens license, and would like to discuss the possibilities for upgrading your license to a floating license, please feel free to contact us.

Alternative multi-user solutions

An alternative method to enable multi-user access to Huygens is Remote Display, which is already possible with with a node locked Huygens Essential or Professional license. In addition, also the Huygens Remote Manager with the Huygens Core as its powerful engine offers a great multi-user solution for facilities with a central image processing server. The remote display option requires all connected systems to be part of the same network. The Huygens Remote Manager allows web-based deconvolution, analysis and visualization and is not strictly limited to a certain network. Both solutions are also ideally suited for high-throughput image processing and very large scale deconvolution.

Frequently Asked Questions




  • Check if you have a working internet connection.
  • Check if your firewall blocks the outgoing connections.
  • Check if you supplied us with the correct IP addresses.

We offer a free test period for the floating license, during which you could get an initial estimate of the concurrent usage. Please contact sales at svi.nl if you are interested to set up a floating license test.
As a rough estimate, you could also use the following guideline: one floating license is typically sufficient for usage on 3 different workstations and for 6 systems we would advise 2 floating licenses. When you would like to make Huygens available on more than 6 systems, other factors can determine the actual concurrent usage.
If the concurrent usage turns out to be more than the initial estimate, then it is possible to purchase additional floating licenses, or you can also choose to reduce the concurrent usage by shrinking the IP range. You will be informed in time if this would be the case such that we can offer the best suited option.

SVI has 3 floating license servers (the servers that validate the floating licenses) spread at different locations around the world. Each server acts as a back-up of the other two servers. So the chance of all servers being down simultaneously is very slim. In the extreme rare event that all three servers are down, we still have an additional protection system: each Huygens instance will remain to work for 72 hours after it was last used. This would give SVI more than enough time to restart the servers, with minimal interference for the end-user.
So all-in-all the Huygens floating license system is well protected against possible failures, and ensures minimal impact for the actual user in case of server issues.

Contact Information

Scientific Volume Imaging B.V.

Laapersveld 63
1213 VB Hilversum
The Netherlands


Phone: +31 (0)35 64216 26
Fax: +31 (0)35 683 7971
E-mail: info at svi.nl

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