Purpose

Clear separation between what this library ships and what requires separate TfL permission. Installing a registry item does not grant rights to protected TfL assets.

Four distinctions

Official line colours

Used for accurate line identity via Line colours & badges / tfl-ts colour helpers.

Protected TfL marks

Roundel and related trademarks — env-gated; see Roundel.

Licensed TfL typefaces

Johnston / TfL Go require a font licence. Demos use Hammersmith One. See Typography.

Safe defaults & alternatives

Open fonts, gated Roundel, and colour utilities that do not imply brand endorsement.

Do / don’t

• Do attribute geographic basemap data where required.
• Do keep credentials and brand toggles in the application layer.
• Don’t redistribute Johnston or Roundel artwork without permission.