Set the License

In order to use DVT’s features, you must obtain and set the license.

The license must be passed to the application through one of the following environment variables:

  • DVT_LICENSE_FILE

  • DVTLMD_LICENSE_FILE

  • LM_LICENSE_FILE

Environment variables will be read in the order above and the first non-empty value will be used, the others will be ignored. Any variable containing only the string “FLEXLM” (case-insensitive) will be ignored.

Important

Environment variables must be set before starting the application and the application must inherit the variables (e.g. when setting the variables in a terminal the application must be started from the same terminal).

Note

The license can also be passed through the DVT.license.source setting accessible by using the Preferences: Open Settings command. Its value has precedence over license environment variables when DVT.environment.precedence is set to “Settings environment variables”.

The license environment variable or setting value must contain one or more FlexLM license sources. Supported license sources are:

  • File-system path of a license file: /path/to/dvt.lic

  • License server address as port@host: 27001@licsrv

  • Three-server redundancy triad with comma (,) separated license servers: 27001@licsrv1,27001@licsrv2,30001@licsrv3

  • File-system path of a directory containing one or more license files with .lic extension: /path/to/lic_dir

  • Multiline string with the content of a license file surrounded by three curly brackets: {{{...}}}

Multiple license sources, with the exception of multiline string, can be specified by separating them with:

  • colon (:) on Linux/MacOS

  • semicolon (;) on Windows

  • ampersand (&) on any OS

Note

If the host part of port@host is an IPv6 address, make sure to always include the ampersand (&) separator before or after, even if there are no more license sources.

Note

If the host part of port@host is resolved by DNS to both IPv6 and IPv4 addresses while the server is only IPv6 accessible, the application must be started with the -Djava.net.preferIPv6Addresses=true vmargs.

The license features are checked out when a DVT Language Server is started by VS Code. A license indicator is available in the application’s status bar, selecting it will open the license log.

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