copyrighted: marks the stream as "copyrighted", but who cares, anyway?

add 16 Bit Checksum: when enabled two bytes of every frame will be replaced by a checksum. Nice error protection, but it can cause a little loss in quality.

original: marks the stream as "original". Man, those flags don't mean a thing. :)

use ISO MPEG specs: this forces Lame to strictly use the ISO specs. It usually makes your MP3s larger with NO difference in quality.

don't use short blocks: all MPEG frames will use long blocks.