1. A computer-implemented method, comprising: receiving a protected version of content that comprises different encryption chains each including encrypted blocks of content, wherein the protected version of content also includes decryption information for decrypting the encrypted chains, the decryption information including at least some initialization vectors that are distinct from the content; performing chained decryption on a particular sequence of data blocks including multiple encryption chains from the protected version of the content and at least some of the initialization vectors, wherein said at least some of the initialization vectors are positioned between the encryption chains within the particular sequence such that during the chained decryption the initialization vectors are decrypted in sequence with the data blocks of the encryption chains, the chained decryption resulting in a sequence of decrypted data blocks including decrypted initialization vectors; and generating a decrypted version of the content by excluding the decrypted initialization vectors from the sequence of decrypted data blocks.