Copyright doesn't really expire, except that thing of X decades after someone's death, because then it becomes public domain. IMHO you shouldn't need a range. I've seen at least one best-voted answer saying this on stackoverflow.
- [dev] bump copyright years? Tom Schwindl
- Re: [dev] bump copyright years? Andrea Calligaris
- Re: [dev] bump copyright years? Al
- Re: [dev] bump copyright years? Laslo Hunhold
- Re: [dev] bump copyright years? Hiltjo Posthuma
- Re: [dev] bump copyright years? Daniel Littlewood
- Re: [dev] bump copyright years? Tom Schwindl
- Re: [dev] bump copyright years? fossy