Some font vendors (e.g. Adobe) specifically allow modifications of their fonts, but many (I suspect most) specifically prohibit any form of modification in their EULAs.
I can think of a number of reasons (three main ones, really) why foundries might want such a clause but, as someone who isn’t actually involved in the type business, I have no idea of whether the reasons I’ve come up with are actually the same reasons which motivate font vendors.
I was wondering if anyone who includes a no-modification clause in their EULA might be willing to share their rationale on this issue.
Any insights would be appreciated,