"You normally need a license for each machine that's running CatDV, whether actively logging or just searching the database. However, if one person has two machines they're the main user of (for example, one laptop and one desktop, or one at work and one at home) and they only use CatDV on one or the other at a time then you're allowed to share a license between the two machines.
The upgrade from CatDV Pro standalone to the Workgroup Server is very seamless. It's the same desktop application, the only difference is whether you save catalogs to a local file or publish them to the server so they're available to everyone.
(The only slight inconvenience with buying one then upgrading a short time later is you might end up with separate license codes to manage, eg. a single user and a 4-user license. If you think you're quite likely to go for a server but aren't 100% sure you want to commit to that until you've tried it, just drop us a line requesting a fully functional temporary evaluation code while you try it out.)"