PIR 2 Software-only vs. HW Assisted

Ways exist to achieve PIR via software-only protocols. These definitely have more theoretic karma. [Chor, Goldreich,… 95; Gertner,Goldwasser,... 98; Cachin, Micali,... 99; Beimel,Ishai,... 00]
However:
- Current software schemes require linear time per retrieval.
- Using secure hardware allows server to participate in existing protocols, like http or LDAP, without modifying the client software—Practical PIR [Smith, Safford 01; Asonov 02]

Ways exist to achieve PIR via software-only protocols. These definitely have more theoretic karma. [Chor, Goldreich,… 95; Gertner,Goldwasser,... 98; Cachin, Micali,... 99; Beimel,Ishai,... 00]