background lines continuing across the image
taustatrükk üle foto
olemus
dokumendi turvaelement
= a security feature in documents
näiteid
https://i.kinja-img.com/gawker-media/image/upload/s--XQKQmd-5--/c_scale,f_auto,fl_progressive,q_80,w_800/cwp9kh3hme6ehsprtqql.png
