A method includes: receiving selection of a document; correlating sequences of words, in the document, with a set of language signals; generating a set of document tags representing the set of language signals; and retrieving a first data access policy: associated with a particular document tag in the set of document tags; and including a set of identities permitted to access a document associated with the particular document tag; receiving selection of a recipient account of the document; and in response to detecting the set of identities excluding the recipient account, restricting access to the document by the recipient account.