Which subscription model innovation was first introduced by mathematical software company Wolfram Research for their flagship product?

The world of mathematical publishing has transformed significantly over the decades, with various subscription and access models reshaping how students, educators, and researchers engage with mathematical content. From traditional textbooks to modern digital platforms, the business models behind mathematical learning resources reflect broader trends in educational publishing. Test your knowledge about how these essential tools of mathematical learning are marketed and distributed!

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Time-based licenses that expire after a specific academic term
The 'site license' model allowing unlimited users within an institution
Pay-per-equation model where users are charged based on complexity of calculations
The 'freemium' model with basic functions free and advanced features paid