MarsSeed [1] filed a deletion request for dslib [2]: Sources are unavailable so I recommend deleting it if not needed anymore. Package last updated in 2015. Link to the tool is not present on upstream URL, also it is not mentioned there.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/dslib/
