387 and 663 cover error correction. There may be some merit in these, but a few companies tried patenting Turbo codes for broadcasting some years ago and got their fingers burnt. (That clever bloke from Cambridge who wrote the alternative energy report showed that all Turbo codes were a subset of an existing error correcting scheme.)
283 seems to be a way of efficiently transmitting video encoding data. This may actually be novel.
The rest look rather over-broad, basically how do you get high bandwidth, time-critical stuff over a network. (DVD bitstreams? What?)
Look like typical US patents to me. Not sure this would fly in Europe. DVB standards are all FRAND based. Compression standards are a bit more confusing, because of the sheer number of researchers, overlapping ideas and not everybody agrees to licence stuff as FRAND.
Edit David MacKay was the prof. He showed that LDPC codes (invented/discovered by Gallager in 1960) were a superset of all Turbo codes. This wiped out a promising business model/technical blackmail scam overnight.