User's Manual Part 2

KOBOEREADERUSERGUIDE 22
  argumentpassedwhenthefacilityisinvoked,thenyoumustmakeagoodfaith
  efforttoensurethat,intheeventanapplicationdoesnotsupplysuchfunctionor
  table,thefacilitystilloperates,andperformswhateverpartofitspurpose
 remainsmeaningful.
 (Forexample,afunctioninalibrarytocomputesquarerootshasapurposethatis
 entirelywell‐definedindependentoftheapplication.Therefore,Subsection2drequires
 thatanyapplication‐suppliedfunctionortableusedbythisfunctionmustbeoptional:
 iftheapplicationdoesnotsupplyit,thesquarerootfunctionmuststillcompute
squareroots.)
 Theserequirementsapplytothemodifiedworkasawhole.Ifidentifiablesectionsof
 thatworkarenotderivedfromtheLibrary,andcanbereasonablyconsidered
 independentandseparateworksinthemselves,thenthisLicense,anditsterms,do
 notapplytothosesectionswhenyoudistributethemasseparateworks.Butwhenyou
 distributethesamesectionsaspartofawholewhichisaworkbasedontheLibrary,the
 distributionofthewholemustbeonthetermsofthisLicense,whosepermissionsfor
 otherlicenseesextendtotheentirewhole,andthustoeachandeverypartregardless
 ofwhowroteit.
 Thus,itisnottheintentofthissectiontoclaimrightsorcontestyourrightstowork
 writtenentirelybyyou;rather,theintentistoexercisetherighttocontrolthedistribution
 ofderivativeorcollectiveworksbasedontheLibrary.
 Inaddition,mereaggregationofanotherworknotbasedontheLibrarywiththeLibrary
 (orwithaworkbasedontheLibrary)onavolumeofastorageordistributionmedium
 doesnotbringtheotherworkunderthescopeofthisLicense.
3. YoumayopttoapplythetermsoftheordinaryGNUGeneralPublicLicenseinstead
 ofthisLicensetoagivencopyoftheLibrary.Todothis,youmustalterallthenotices
 thatrefertothisLicense,sothattheyrefertotheordinaryGNUGeneralPublicLicense,
 version2,insteadoftothisLicense.(Ifanewerversionthanversion2oftheordinary
 GNUGeneralPublicLicensehasappeared,thenyoucanspecifythatversioninsteadif
 youwish.)Donotmakeanyotherchangeinthesenotices.
 Oncethischangeismadeinagivencopy,itisirreversibleforthatcopy,sotheordinary
 GNUGeneralPublicLicenseappliestoallsubsequentcopiesandderivativeworks
madefromthatcopy.
 ThisoptionisusefulwhenyouwishtocopypartofthecodeoftheLibraryintoa
 programthatisnotalibrary.
4. YoumaycopyanddistributetheLibrary(oraportionorderivativeofit,underSection2)
 inobjectcodeorexecutableformunderthetermsofSections1and2aboveprovided
 thatyouaccompanyitwiththecompletecorrespondingmachine‐readablesourcecode,