The problems (3)

Then some more issues pop up

Quote from the first page of NavTeq SDAL format doc

For viewing purposes only. No rights to implement all or any part of the specification disclosed herein are granted or implied. Agreement to the terms and conditions set forth in the SDAL (R) Format Version 1.7 Adopters Agreement (CD-ROM) is required.

of course, covered by a multitude of patents

for exemple, US patent 6591270

Only the US have a somewhat freely useable database