Copy prevention method and apparatus of a digital recording/reproducing system

A copy prevention apparatus of a digital magnetic recording/reproducing system comprising:

• an encrypted marker detecting and inserting part for detecting a marker from input bit strips, and inserting an updated marker to said bit strips to output the result;
• a marker analyzing and processing part for decrypting and analyzing the encrypted marker from said marker detecting and inserting part by means of an encoded key, outputting a control word for descrambling said bit strips, and updating and encrypting the decrypted marker by means of said encoded key to output the result;
• a buffer part for buffering said control word and updated and encrypted marker from said marker analyzing and processing part, and inserting said updated and encrypted marker in said marker detecting and inserting part;
• and
• a descrambler for descrambling said bit strips provided via said marker detecting and inserting pant by means of said control word from said buffer part.

A method of transmitting digital data using a data processing apparatus including a scrambler, the method comprising:

• generating control data for initializing the scrambler;
• initializing the scrambler based on the control data directly input into the scrambler;
• scrambling, using the same initialized scrambler and the same control data, both digital audio data and digital video data;
• generating a first 188 byte data block including a header with the control data used to initialize the scrambler and a scrambled data portion including the scrambled digital audio and/or digital video data;
• generating at least a second 188 byte data block including the scrambled digital audio and digital video data and not including the control data;
• determining if a minimum of a multiple of four 188 byte data blocks have been scrambled;
• determining if a timing point that includes a decimal fraction of 0.66 control words per second (CW/s) has passed since a previous initialization of the scrambler;
• re-initializing the scrambler based on a new control word when the determining steps determine either the minimum of the multiple of four 188 byte data blocks have been scrambled or the timing point that includes the decimal fraction of 0.66 control words per second (CW/s) has passed since the previous initialization of the scrambler;
• and
• transmitting, by the data processing apparatus, the generated first data block and the at least second data block.

An apparatus for transmitting digital data, comprising:

• a processor;
• and
• a memory connected to the processor and including executable instructions that when executed by the processor, cause the processor to perform:
• generating control data for initializing the scrambler;
• initializing the scrambler based on the control data;
• scrambling, using the same initialized scrambler and the same control data, both digital audio data and digital video data;
• generating a first 188 byte data block including a header with the control data used to initialize the scrambler and a scrambled data portion including the scrambled digital audio and/or digital video data;
• generating at least a second 188 byte data block including the scrambled digital audio and digital video data and not including the control data;
• determining if a minimum of a multiple of four 188 byte data blocks have been scrambled;
• determining if a timing point that includes a decimal fraction of 0.66 control words per second (CW/s) has passed since a previous initialization of the scrambler;
• re-initializing the scrambler based on a new control word and based on the determination that either the minimum of the multiple of four 188 byte data blocks have been scrambled or the timing point that includes the decimal fraction of 0.66 control words per second (CW/s) has passed since the previous initialization of the scrambler;
• and
• transmitting the generated first 188 byte data block and the at least second 188 byte data block.