I can not think of one mod that you need permission for to use in your own private use modpack. Even XCompWiz (Mystcraft) and Sph4x (Optifine), who make a real challenge of inclusion of their mods in public packs or don't allow you to distribute their mod at all, don't make a problem of this.
A mod is meant to be used.
Oh and sorry for falsely accusing you. :/
It's fine. If I had as much experience on the forums as you being here from 2013 I probably would have thought the same thing.
Also if you hadn't said that I may never had learned the difference between a public and private modpack, so thanks dude.
no hard feelings