{"id":"Jam","title":"Jam License","reviewed_on":"2026-09-15","reviewer":"Giray Havur","text_source":"https://raw.githubusercontent.com/spdx/license-list-data/main/text/Jam.txt","text_retrieved":true,"verdict":"created","summary":"The record models the Jam license, three lines granting free use and distribution as long as the copyright notice is retained and modifications are clearly marked. It is the one record of this review group with a modification notice duty and without a notice duty for the license text itself.","findings":[{"rubric":3,"severity":"major","field":"odrl:permission","description":"The whole grant reads: \"License is hereby granted to use this software and distribute it freely, as long as this copyright notice is retained and modifications are clearly marked.\" Distributing modified copies is assumed by the marking condition, so modify, derive, modified works and derivative works are permitted alongside reproduce, distribute, display, present and commercial use.","action":"applied"},{"rubric":5,"severity":"major","field":"odrl:duty","description":"cc:Attribution on distribute, modify and derive, from the retention of the copyright notice, and dalicc:modificationNotice on modify and derive, from the words modifications are clearly marked. There is no cc:Notice duty: the text asks for the copyright notice, not for the license text. Review decision 8 removed the modification notice from MIT because MIT says nothing about changes; here the text says it in as many words.","action":"applied"},{"rubric":4,"severity":"info","field":"odrl:prohibition","description":"No prohibitions. dalicc:ChangeLicense is not prohibited, unlike almost every other record of this review group, because the text requires only the copyright notice to be retained and says nothing about the license travelling with a copy.","action":"none"},{"rubric":6,"severity":"minor","field":"dalicc:WarrantyDisclaimer","description":"The disclaimer is one line, \"ALL WARRANTIES ARE HEREBY DISCLAIMED.\", quoted verbatim. There is no liability clause.","action":"applied"},{"rubric":7,"severity":"info","field":"cc:jurisdiction","description":"The text names no legal system and no term, so cc:jurisdiction is dalicc:worldwide and dalicc:validityType is dalicc:perpetual.","action":"none"},{"rubric":2,"severity":"info","field":"odrl:target","description":"One odrl:AssetCollection of dct:type dcmitype:Software, following MIT. The text licenses the software only.","action":"applied"},{"rubric":9,"severity":"info","field":"record","description":"The consistency check with the axioms of dg_default returned no conflicts.","action":"none"},{"rubric":10,"severity":"info","field":"record","description":"The license of the Perforce Jam build tool, distributed with Boost. It has no sibling in the library; the closest shape is MIT without the notice condition and with a change-marking duty.","action":"none"},{"rubric":3,"severity":"major","field":"odrl:permission","description":"Library convention 15: a licence that asks for no reciprocity and no source code asks only that the notice travels with the copy, which is a duty on the acts it governs and not a bar on putting the copy under other terms. dalicc:ChangeLicense is therefore a permission here, and the prohibition the earlier reading wrote is removed. The text reads: \"License is hereby granted to use this software and distribute it freely, as long as this copyright notice is retained and modifications are clearly marked.\" The permission carries the dalicc:compliantLicense duty, as Apache-2.0 does, because the notice has to survive the relicensing.","action":"applied"}],"family":"Permissive: MIT, ISC and BSD-like","port_of":null,"variant_kind":null,"notes":"Modelled from the SPDX plain text. cc:legalcode points at the Boost documentation copy SPDX lists first; the second reference SPDX gives is an archived copy of the Jam README."}