0 5 ) ▁to ▁ 8 . 5 4 ▁( 2 0 0 6 - 0 5 - 1 7 ), ▁now ▁abandoned . ▁ ▁AG PL ▁Ghost script ▁is ▁the ▁canonical ▁variant ▁available , ▁since ▁February ▁ 2 0 1 3 , ▁under ▁the ▁GNU ▁Af fer o ▁General ▁Public ▁License ▁which ▁is ▁a ▁free ▁software ▁license . ▁▁ ▁GNU ▁Ghost script ▁is ▁part ▁of ▁the ▁GNU ▁project ▁and ▁is ▁now ▁derived ▁from ▁G PL ▁Ghost script . ▁ ▁G PL ▁Ghost script ▁is ▁the ▁basis ▁for ▁Display ▁Ghost script , ▁which ▁adds ▁Display ▁Post Script ▁functionality ▁support . ▁ ▁Ghost script ▁is ▁the ▁current ▁commercial ▁propriet ary ▁version ▁lic ensed ▁by ▁Art if ex ▁Software ▁for ▁inclusion ▁in ▁closed - source ▁products . ▁ ▁Ghost ▁T rap ▁is ▁a ▁variant ▁of ▁G PL ▁Ghost script ▁secured ▁and ▁sand box ed ▁using ▁Google ▁Chrome ' s ▁sand box ▁technology . ▁ ▁ESP ▁Ghost script ▁was ▁a ▁G PL ▁Ghost script ▁fork ▁for ▁ESP ' s ▁C UP S ▁and ▁merged ▁with ▁G PL ▁Ghost script . ▁ ▁Front ▁ends ▁▁ ▁Ghost script ▁GUI s ▁view ▁Post Script ▁or ▁PDF ▁files ▁on ▁screens , ▁scroll , ▁page ▁forward , ▁page ▁back ward , ▁zoom ▁text , ▁and ▁print ▁page ( s ). ▁ ▁Ev ince ▁ ▁G S view ▁( Version ▁ 5 ▁and ▁ 6 ▁are ▁now ▁un supported ) ▁ ▁Ir fan View ▁import ▁and ▁display ▁PDF ▁files ▁ ▁In ks cape ▁import ▁and ▁display ▁PDF ▁files ▁ ▁virtual ▁printer s