remapping in Poland - legal use of UMP-imports

I mainly remap roads like tertiary and unclassified all around in the country. And so I found that:
There are a lot of FIXME-nodes and single nodes without tags mainly as a remain of imported ways from UMP, which could be helpfull to restore them
The user disagreed the new licence but declared his data as ODbL-compatible:
May I use the lost nodes to restore ways etc. and what should happen with the FIXME-nodes without any other information?

Regards from Germany