5.1 HBL may at any time, in its sole discretion, restrict the number of Authorized Users and impose restrictions, limits or parameters on Requests or Clients.  HBL maintains filters to prevent Requests that do not comply with financial, operational and risk control requirements.  These pre-trade restrictions, limits and parameters may delay or prevent Requests from being submitted, require HBL to not respond to and/or confirm Requests, or result in delays in the execution of Brokerage Transactions.  Such restrictions, limits and parameters may be amended, increased, decreased, removed or added to by HBL in its sole discretion, upon notice to Client, if practicable, and may include (without limitation): (i) controls over maximum Request sizes; (ii) controls over HBL's total exposure to Client; (iii) controls over Requests and/or Brokerage Transactions that may indicate duplicative or clearly erroneous Requests and/or Brokerage Transactions; or (iv) any other restrictions, limits, parameters or controls that HBL may be required to implement in accordance with applicable regulations or its internal policies and procedures.  Client agrees to abide by such restrictions and to be responsible for any Request and/or Brokerage Transaction that violates such restrictions or exceeds such limits.  Even if a Request is within the restrictions, limits and parameters set by HBL, HBL has sole discretion to not respond to and/or confirm such Request.