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She further noted that nonexclusive licenses of copyright rights need not be in writing , but often are . Upgrades need only be performed on centralized systems instead of highly replicated resources distributed throughout an organization ; this reduces the cost of upgrades and maximizes their impact across the organization as a whole . These reports need not be polished papers , but they should describe work that has been completed as of the time of their submission . Repayments need not be made by the borrower and interest does not accrue during the grace period . Specifically , the rules state that on-call physicians need not be on-call at all times .