Kramer Electronics EDID Designer - Manual (Page 11)

EDID Designer - Defining the EDID Designer 9
Figure 3 shows the sources of the EDIDs that are used by EDID Designer and
whether they are read-only (R/O) or read/write (R/W).
Note: To edit an EDID from a R/O source (for example, a local PC monitor), save
it locally on your PC. This changes it to a locally saved file that can be edited.
Figure 3: EDID Sources