PKCS#11 v2.20 : Cryptographic Token Interface Standard
pkcs-11v2-20.pdf - 28 June 2004
PKCS#11 v2.20 Amendment 1 : PKCS#11 Mechanisms for One-Time Password Tokens
pkcs-11v2-20a1.pdf - 27 December 2005
PKCS#11 v2.20 Amendment 2 : PKCS#11 Mechanisms for the Cryptographic Token Key Initialization Protocol
pkcs-11v2-20a2.pdf - 27 December 2005
PKCS#11 v2.20 Errata
pkcs-11v2-20errata.txt - 14 November 2006