Content encryption

A system, comprising:

• a memory device storing instructions;
• and
• a processing apparatus configured to interact with the memory device, and upon execution of the instructions, perform operations including:
• generating a partially encrypted media that includes a second content portion of a source media encrypted with a first cryptographic key and a first content portion of the source media presentable independently of and without access to the second content portion, the second content portion following the first content portion in the source media;
• encrypting, with a second cryptographic key, the first cryptographic key and an access data specifying access entitlements for the second content portion;
• and
• including, with the partially encrypted media, encrypted data that includes the first cryptographic key and the access data.

A non-transitory computer readable medium storing instructions executable by a data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising:

• generating a partially encrypted media that includes a second content portion of a source media encrypted with a first cryptographic key and a first content portion of the source media presentable independently of and without access to the second content portion, the second content portion following the first content portion in the source media;
• encrypting, with a second cryptographic key, the first cryptographic key and an access data specifying access entitlements for the second content portion;
• and
• including, with the partially encrypted media, encrypted data that includes the first cryptographic key and the access data.