Providing Annotations of a Digital Work

A method of presenting an annotation on an eBook reader device, the method comprising:

• receiving an annotation of a digital work;
• storing the annotation in association with the digital work;
• receiving an authorization credential granting access to the annotation;
• and
• if the authorization credential is valid, presenting the annotation of the digital work on the eBook reader device in context with regard to the digital work.

An eBook reader device comprising:

• a processor;
• and
• memory in communication with the processor, the memory comprising:
• a digital work,
• an annotation associated with the digital work, the annotation being separate from the digital work, such that the digital work is unaltered by the provision of the annotation;
• and
• a plurality of unique invariant location reference identifiers,
• wherein the digital work is partitioned into a plurality of segments and each segment of the digital work is assigned one of the invariant location reference identifiers, such that each invariant location reference identifier is uniquely assigned to a corresponding segment of the digital work.