FAQ

For how many users or PCs do I get a license key?

The license key for Hydras 3 is valid for one user at one PC. So if there are several users (the user is identified by the Windows login name) on one PC, several licenses are required. If a key is used by several users or on several PCs, a corresponding notification appears in the Hydras 3 message window (below the menu bar in red letters). OTT also tolerates the use of a license key on several computers of the same user (e.g. a desktop PC and a laptop for field use) as long as they are not used at the same time - this is taken into account in the validation as of version 4.0.4.

If the license of a retired user is to be used for another user or if Hydras 3 is to be installed on a new PC, please proceed as follows:

1. Confirm or delete message by double-clicking on it
2. Please make sure that you have the license code for your Hydras 3 version ready. If you cannot find it, please copy the following registry entry to the new computer or to the account of the new user: \HKEY_CURRENT_USER\Software\Ott-Hydrometry\Hydras3\General\GUID (your IT department will certainly help you). Also note the ID in Hydras 3 below the version number in the menu item Help / Info (Tip: because of the short display time please make a screenshot with the button "Print", insert it into the program Paint or similar and save it as file)!
3. Uninstall Hydras 3 on the old computer (make a data backup of the workspace directories and the program directory of Hydras3 before! Only when moving to a new computer) or delete the above mentioned registry key of the retired user.
4. Delete the following file from the reported workspace directory: userlist.log
5. Restart Hydras 3 - the message should no longer appear. If necessary repeat point C) for further workspace directories.

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