EDA tool industry has long been using the time-based licensing model for their tools, particularly using the FlexLM based licensing system.
How can they even think to patent this sort of thing ?
Carefully repowering SRAM can maintain the contents. I have seen SRAM come up with essentially 99% of the contents still intact after the SRAM had been powered down for over a week. I guess that once powered up, the SRAM has a preference to come back the way it was before powerdown.
Or perhaps the slight residual voltage kept the SRAM contents intact. (Even though it was probably less than one tenth of a volt.) SRAM draws very little current when the voltages are reduced. Thus the power rails can maintain some small voltage for a very long time.
I would really like to see any citation to support your point. If true, this is really an interesting concept.
"Life is a garment we continuously alter, but which never seems to fit." -- David McCord