It seems to me that MP3 couldn't possibly have all these inventions in it.
1. Conversion from spacial domain to frequency domain. This is Fourier mathematics (1600's Mathematician).
2. Removal of frequency components that are masked by other sounds present. (The big idea claimed by Frauenhofer labs).
3. Huffman compression (MIT 1952).
Looks like a troll to me, all of those companies couldn't possibly own patents in what is a relatively simple system.