Just to throw this question out there. At several levels:
1. Logos/Wordmarks
Maybe I'm wrong but I'd say quite a few people would start off a logo/wordmark with an exisiting typeface and modify it. Any IP/copyright issues with this?
2. Typeface creation
Whats the position on creating a new typeface off an existing typeface. I'm sure designers/typographers have been known to start off using a basic set to get things moving quickly. I assume there are infringements in this realm. or am I wrong.
Are there typefaces that allow you to modify them without any issues?
Obviously the ideal if you were a 'pure' type designer is to design from scratch. However at the end, how does anybody know whether a typeface is a modification of an existing one (unless its blatantly obvious and hasn't been modified much) or one from scratch - unless you keep and show original hand sketches..
Would like to hear your opinions