Per-seat

A value metric (also called a licensing metric) where the customer buys a fixed count of "seats." The seat assignment model determines who can use them. In modern B2B SaaS the dominant variant is named-seat: each seat is assigned to a specific person, the same person uses that seat every time, and changing the assignment requires an admin action (Slack, Zoom, Atlassian, HubSpot). The legacy / specialized variant is concurrent-seat (also called floating or pooled): a smaller pool of seats serves a larger population, where any M users can use the software simultaneously up to the seat count, and seats are checked in/out as users come and go — common in shift-based workforces, design tools, and on-prem enterprise (Citrix, AutoCAD, MATLAB). The two are structurally different licensing models with different commercial behavior: named-seat is predictable and grows linearly with headcount; concurrent-seat is utilization-bound and grows with peak simultaneous demand. The license agreement, compliance, and audit provisions differ accordingly — named-seat audits compare assigned-user lists; concurrent-seat audits sample peak utilization. When SPP refers to "per-seat" without qualification we mean the named-seat variant unless context makes the concurrent meaning clear.