Patent ID: 7555123

Claim:
A set-top box apparatus comprising: a first filter configured to receive a transport stream comprising packets having a first PID value of a first program, at least some packets having said first PID value being encrypted with a first encryption scheme, said first filter being configured to filter out said encrypted packets having said first PID value of said first program from said transport stream and to output unencrypted packets having said first PID value of said first program; and a second filter configured to receive a transport stream comprising packets having a second PID value of said first program, at least some packets having said second PID value for the first program being encrypted with a second encryption scheme, said second filter being configured to filter out packets other than said encrypted packets having said second PID value of said first program from said transport stream and to decrypt said encrypted packets having said second PID value of said first program without remapping PID values to output decrypted packets having said second PID value for said first program.