During WW II and up to 1949 postcards were censored to check that they did not provide any military useful information (landscapes, maps etc).
The cards were marked by the printers, and could not be sold without the cancellation.
In 1948 the sale of postcards was turned into a state monopoly. All cards were given the cancellation MONOPOLUL CARTILOR POSTALE ILLUSTRATE.
All these cancellations do not affect censorship of text.
Litterature: Telegut:  Romanias Censorship of Post Card Pictures
                               SPA Journal of American Philatelic Society

Jul 49 -
May 50		 violet 17 - 20mm aabw1.jpg (3377 bytes)
Printers: ALBANIA and M.C.FLORESCU in Constanta
Jul 49 violet 20mm aabw2.jpg (4173 bytes)
Printers: LIBRANIA ROMANEASCA in Deva
May 48 violet 19/18mm aabw3.jpg (3808 bytes)
Printers: PROGRESUL in Sibiu
  red 18:11mm aabw4.jpg (2543 bytes)
Min.Informatii/Cons. Cultural/JUD CIUC
not found used postally as yet
  violet 22/21mm aabw5.jpg (5036 bytes)
Romania/MINISTERIUL INFORMATIILOR/Regionala Craiova
1945-
1950		 violet 23/22mm MINISTERIUL INFORMATIILOR/Regionala Craiova
Printers: M.C.FLORESCU in Craiova.
  violet 22mm aabw6.jpg (4529 bytes)
Romania/ Prefectura Jud. C-lung
Dec 43 violet 20mm aabw7.jpg (3848 bytes)
Guvernamantul Provinciei/Bucovina/ Serviciul Cenzurei
1948 violet 10:10 to
14:14mm		 aabw8.jpg (3256 bytes)
MONOPOLUL CARTILE/ POSTALE ILLUSTRATE
1945 red 30/28mm aabw9.jpg (6645 bytes)
Ministerul Informatiilor / Regionala Timisoara
1943 violet 24mm aabw10.jpg (5032 bytes)
R.P.R./ Ministerul Informatiilor / Inspectoratul /
Judetean / Odorheiu
1945 black 17:10mm aabw11.jpg (2199 bytes)
MINISTERUL/ INFORMATIILOR/ DIR. CULTURALA