Part of software licence that’s old (5)

I believe the answer is:

relic

'that's old' is the definition.
(relics are old)

'part of software licence' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'RELIC' can be found hidden inside 'software licence'.

(Other definitions for relic that I've seen before include "Venerated memento" , "Left over item, sometimes sacred" , "Memorial object" , "Survival from an earlier time" , "Object from antiquity" .)

I've seen this clue in The Guardian.

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