Trados Studio 2011 stopped working: invalid digital signature
Thread poster: Aviation Expert

Aviation Expert  Identity Verified
Local time: 13:42
Member (2011)
English to German
+ ...
Apr 1, 2014


Please help, I have a serious problem with SDL Trados Studio 2011. When I try to open the program, the following error message appears:

Invalid digital signature - The licensing component could not be authenticated. Possible causes: - The licensing component has been modified - The Root Certificate Authorities store is out-of-date. This can be updated through Windows Update.

I have followed the steps that are explained in the knowledge database, I downloaded and installed the Windows Root Certificate Authority Update, the latest I could find was for March 2014. I installed and rebooted, but the problem remains. I even uninstalled and reinstalled Studio, but it didn't help.

Last night, everything still worked fine, I didn't make any changes since then, it suddenly just stopped working this morning. Multiterm is still working normally, and all my other programs are also running fine. I'm using Windows XP SP3.

I can't even deactivate the license in Trados, it's completely blocked.

Thank you for your help!


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SDL Community  Identity Verified
United Kingdom
Local time: 13:42
Please contact SDL Support... Apr 1, 2014

... through the solution finder and they will be able to help you resolve this.

Go to the Knowledgebase;

Then go to the tab called Solution Finder ( ) and now go here;

Licensing Problems
- I use SDL Trados Studio / SDL Passolo – 2011 or 2014

Pick the correct route for you and if appropriate you will be presented with a form that you can fill in to generate a support request and you will be contacted, normally within a day.

Also make sure your email address is entered correctly or nobody will be able to get back in touch with you.



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