RRD is the Acronym for Round Robin Database. RRD is a system to store and display time-series data (i.e. network bandwidth, machine-room temperature, server load average). It stores the data in a very compact way that will not expand over time, and it presents useful graphs by processing the data to enforce a certain data density. It can be used either via simple wrapper scripts (from shell or Perl) or via frontends that poll network devices and put a friendly user interface on it.
There were generally two main distributions of the software, each with different licensing implications:
For retail versions, the 25-character key is almost always located on a yellow or orange sticker on the back of the CD sleeve or inside the plastic case. Important Licensing & Support Warnings
You may find "New Old Stock" (NOS) physical CD cases on sites like eBay. Ensure the original COA (Certificate of Authenticity) sticker is present inside the case, as the product key is typically printed there. How to Recover an Existing VFP 9.0 Product Key
A contract developer inherits a VFP project. They need to install the IDE on a modern Windows 10/11 machine, but the original license key is lost or belongs to a previous employer.