Ensure that we detect correctly the time-based future part of some proprietary licenses

[pombredanne]

See for instance https://raw.githubusercontent.com/storyprotocol/protocol-core-v1/refs/heads/main/LICENSE

This is proprietary business source license that devolves into a GPL

[mjherzog]

So what do we do with time-based terms as here: "Effective on the Change Date, or the fourth anniversary of the first publicly available distribution of a specific version of the Licensed Work under this License, whichever comes first, the Licensor hereby grants you rights under the terms of the Change License, and the rights granted in the paragraph above terminate." where there are 2 timeframes to deal with.
I expect that the best we can do is detect the presence of such terms and possibly what they are (as a text section).