Assertion: copyright | /r/CapableOf | retain their copyright
Facets:
value: before 1999
type: TEMPORAL
value: until 2049
type: TEMPORAL
Source sentences:
text: Copyright in unpublished works was limited to 50 years after the creator's death, but unpublished works by creators who died after 1948 but before 1999 retain their copyright until 2049.