Efficient rebinding of partitioned content encrypted using broadcast encryption

A system for decrypting media content, comprising:

• a processor;
• a memory coupled to the processor;
• and
• logic, stored on the memory and executed on the processor, for:
• receiving a request to render a first item of media content,
• wherein the first item of media content is associated with a first storage partition and a first title key, and
• wherein the first storage partition is associated with a second item of media content, a first management key block (MKB), a first binding ID (IDb) and a first authorization table (AT);
• calculating a first current MKB, a first current IDb and a first current AT;
• determining when the first MKB, the first IDb and the first AT match the first current MKB, the first current and the first current AT, respectively;
• and
• when the first MKB does not match the first current MKB, the first IDb does not match the first current IDB or the first AT does not match the first current AT, generating a second storage partition, the generating comprising:
• rebinding the first item of media content with respect to the first current MKB, the first current IDb and the first current AT to generate a second title key;
• associating the first item of media content, the first current MKB, the first current IDb, the first current AT and the second title key with the second storage partition;
• and
• disassociating the first item of media content from the first title key, the first MKB, the first IDb, the first AT and the first storage partition;
• wherein the second item of media content remains associated with the first MKB, the first IDb, the first AT and the first storage partition.

A computer programming product for decrypting media content, comprising:

• a memory;
• and
• logic, stored on the memory for execution on a processor, for:
• receiving a request to render a first item of media content,
• wherein the first item of media content is associated with a first storage partition and a first title key, and
• wherein the first storage partition is associated with a second item of media content, a first management key block (MKB), a first binding ID (IDb) and a first authorization table (AT);
• calculating a first current MKB, a first current IDb and a first current AT;
• determining when the first MKB, the first IDb and the first AT match the first current MKB, the first current IDb and the first current AT, respectively;
• and
• when the first MKB does not match the first current MKB, the first IDb does not match the first current IDB or the first AT does not match to the first current AT, generating a second storage partition, the generating comprising:
• rebinding the first item of media content with respect to the first current MKB, the first current IDb and the first current AT to generate a second title key;
• associating the first item of media content, the first current MKB, the first current IDb, the first current AT and the second title key with the second storage partition;
• and
• disassociating the first item of media content from the first title key, the first MKB, the first IDb, the first AT and the first storage partition;
• wherein the second item of media content remains associated with the first MKB, the first IDb, the first AT and the first storage partition.