What constitutes the crime of accessory to a crime?

"The crime of accessory consists of the following elements: (1) someone other than the accused, that is, a principal, must have committed a specific, completed felony; (2) the accused must have harbored, concealed, or aided the principal; (3) with knowledge that the principal committed the felony or has been charged or convicted of the felony; and (4) with the intent that the principal avoid or escape from arrest, trial, conviction, or punishment." (People v. Plengsangtip (2007) 148 Cal.App.4th 825, 836.) "It is clear that certain lies or 'affirmative falsehoods' to authorities, when made with the requisite knowledge and intent, will constitute the aid or concealment contemplated by section 32 . . . [] . . . [] In contrast to affirmative falsehoods, the mere passive failure to reveal a crime, the refusal to give information, or the denial of knowledge motivated by self-interest does not constitute the crime of accessory." (Ibid.)