Protection of digital content using block cipher crytography

Abstract

Protection of digital content using a specific application of block cipher cryptography is described. The digital content is encrypted using an encryption key and a calculated initialization vector. The digital content includes a plurality of strides of data and each stride includes a string of data to be encrypted and a block of data to be encrypted. The calculated initialization vector to be used to encrypt the block of data is derived from the string of data in the stride to be encrypted. Furthermore, the initialization vector is calculated by performing an exclusive disjunction function on a seed value and the string of data for each stride.

1 . A computerized method comprising: 
 encrypting digital content using an encryption key and a calculated initialization vector (IV), wherein the digital content comprises a plurality of strides, each stride comprising a string of data to be encrypted and a block of data, and the calculated IV derived from each string of data from each stride.    
   
   
       2 - 44 . (canceled)