Because fonts are created to serve different purposes, they come in different formats and are licensed differently based on their intended uses. FontShop offers font licensing (that's what you're actually paying for) for normal desktop use, webfonts for self-hosting (marked with the suffix Web), and embeddable fonts for eBooks, apps, games, and certain specialty documents. Each foundry license (or end user license agreement) places certain permissions and restrictions on the fonts you download, so that's the source we look to when answering questions about what a given font license permits.
If at checkout you don't find the format, features, platform, period of time, or number of users you're looking for in a standard license, please write us email@example.com.
What's the difference between Basic, Std (Standard), OT (OpenType), and Pro packages? It's primarily glyph support, mostly meaning language support, but also in features such as small caps and multiple figure sets (tabular or proportional, lining or oldstyle, super/subscript, fractions, etc.). The term Basic is also used to describe pared-down family packages that contain only the most essential weights (Regular, Italic, Bold, etc.).
Not all but most fonts can be licensed individually if you don't need the whole family, or if a smaller package is still too much.