[Crusher138]

Are you able to print shirts/monograms using Greek letters?

That is a tentative "Yes". It seems that some Greek organizations have jumped on the licensing bandwagon and are demanding that you pay a licensing fee to be able to print their stuff.

On the other hand, I have customers argue that you can't enforce a copyright on three Greek letters.

[Elsie]

On the other hand, I have customers argue that you can't enforce a copyright on three Greek letters.

We disagree...