Clark Labs offers various licensing options:

In the realm of geospatial analysis and geographic information systems (GIS), few names command as much respect for analytical depth as IDRISI. Developed by Clark Labs at Clark University, IDRISI has long been the go-to platform for researchers and professionals who require robust tools for spatial modeling, remote sensing, and land change analysis.

IDRISI Selva hates long file paths. Maya installed it directly to C:\TerrSet instead of Program Files to avoid cryptic “Error 53” messages later.

That means: