Now I am using ArcGISWPF24.exe and ArcGISAPI31forSilverlight.exe .
Until now, I thought that they were freely used. I think for my tasks these libraries enough.
Contracting authority plans to buy
ArcGIS for Server Enterprise Basic (or ArcGIS for Server Enterprise Standard).
At the initial stage I plan to use for publishing services ArcGIS for Desktop Standard of my friends .
Is this a correct way from the legal point of view?