Following list introduces Polish asset creators for Trainz range, they all release their assets under PTT Open Content Licence.

The 4th column includes assets’ term of validity, so:

„Wszystko(ALL) – all assets of the Author with no exclusions are under the Licence
„Część” (PARTIALLY) only some of the assets are under the Licence. Other assets are under separate licencing due to specific reasons. Payware, for example. Under scuh sign there are list of assets (Kuids/names), which are out of Licence PTT Open Content! Those assets must be not included to the packs and modify in any way – without the Author’s permission.

The 5th column includes terms of modification of the assets for the higher version of Trainz than this one the asset was created for.It allows to modify the asset only by the map and/or support pack’s author and only those features which would help to eliminate errors in higher version of trainz! It is not official permission for any free modifications!

So:
„Zgoda” (FREE)– May be modified, the author doesn’t require announcement (it is up to your kindness);
„Zgoda – za powiadomieniem” (FREE, but announce) – there’s a need to announce the author about the modification. Author may require the upgrade for viewing.
„Brak zgody” (NOT ALLOWED) – The Author forbids the modifications, only distribution of unchanged asset is allowed.

The authors are sorted by KUIDS numbers.