Just wondering, what is under the hood of CatDV? We have a library specialist looking at our setup/workflow and she's asking. Would like to know that if CatDV ceased to be we'd still be able to extract our metadata to port it into something else if need be.
But rest assured, there are plenty of ways to get the data out of CatDV and into other systems if you need to.
The underlying database (assuming you're using the server version) is normally MySQL, but it also works with other databases such as Oracle, MS SQL Server, and PostgreSQL, so you're tied in to one particuar database. We don't make use of specific database features and it's easy to use standard tools SQL tools to generate reports or extract data if necessary.
You can also export the data in lots of ways for import into import into other systems, including XML and tab-separated text etc.