4. Security and Access.  Client may access the Trading Services only through use of one or more passwords, security devices or other access methods as provided by HBL (collectively, "Access Methods").  Client is solely responsible for ensuring that Client's Access Methods are known to and used by only those users that Client authorizes ("Authorized Users").  Client agrees to comply with any reasonable procedures established by HBL for the pre-approval and authorization of Authorized Users.  Client acknowledges that HBL, in its sole discretion, may deny access to the Trading Services to any user of Client's Access Methods.  Client will be (i) solely responsible for all acts or omissions of any person using the Trading Services through Client's Access Methods, (ii) solely responsible for any losses, damages or costs that Client may incur as a result of errors made by, or the failure of, the software or equipment that Client or any Authorized Users use to access the Trading Services, and (iii) without limitation of the foregoing or any other provision of the Electronic Trading Addendum, bound by the terms of any and all Brokerage Transactions executed and/or Requests accepted through the Trading System using Client's Access Methods, in each case unless due to HBL's willful misconduct.  All transmissions generated by use of Client's Access Methods will be deemed to be authorized by Client and made by an Authorized User whether or not HBL acknowledges receipt of such transmission and HBL shall be entitled to act in reliance on such deemed authorization, unless due to HBL's willful misconduct.  If any of Client's Access Methods have been modified, lost, stolen or compromised, Client will promptly notify HBL.  Upon receipt of this notice, such Access Methods will be cancelled or suspended as soon as is reasonably practicable, but Client is responsible for any actions taken through the use of such Access Methods prior to such cancellation.  Client will immediately report any apparent malfunction or breach of security of which Client becomes aware or experiences with the Trading Services.  In the event of a dispute, HBL's communications and Brokerage Transactions log of all Quotes, Brokerage Transactions and communications regarding Brokerage Transactions by Client or its Authorized Users or their Access Methods (the "Brokerage Transactions Log") will be conclusive evidence of the communications contained in them.  Client agrees not to contest the validity or enforceability of the Brokerage Transactions Log in any legal proceedings between the Parties.