This new patent granted on 12/24/13...to Mpman.com

Portable sound reproducing system and method

Note the many patents cited and those that are Edig's:

5787445

5839108

5842170

5491774

Question..if patents are cited then what does that mean?

If they cite our tech..does that mean it is being used, and if so ...would they need a license if they don't already have one?

TIA

iam