Apparatus and method for providing digital contents by using watermarking technique

An apparatus for distributing digital content by using a watermark technique, comprising:

• a watermark extracting means for extracting a watermark signal and transform information from a transformed and watermark embedded digital content signal;
• and
• an inverse-transforming means for generating a watermark embedded digital content signal by inverse-transforming the transformed and watermark embedded digital content signal by using the extracted transform information.

A method for distributing digital content by using a watermark technique, comprising the steps of:

• a) transforming an original digital content signal by using transform information;
• and
• b) generating a transformed and watermark embedded digital content signal by embedding the transform information and a watermark signal into the transformed digital content signal from the step a).

A method for distributing digital content by using a watermark technique, comprising the steps of:

• a) extracting a watermark signal and transform information from a transformed and watermark embedded digital content signal;
• and
• b) inverse-transforming the transformed and watermark embedded digital content signal by using the extracted transform information to thereby output a watermark embedded digital content signal